diff --git a/src/main/java/de/bixilon/minosoft/assets/AssetsLoader.kt b/src/main/java/de/bixilon/minosoft/assets/AssetsLoader.kt
index ac328402c..662b7c023 100644
--- a/src/main/java/de/bixilon/minosoft/assets/AssetsLoader.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/AssetsLoader.kt
@@ -8,14 +8,18 @@ import de.bixilon.minosoft.assets.properties.version.AssetsVersionProperties
 import de.bixilon.minosoft.assets.properties.version.AssetsVersionProperty
 import de.bixilon.minosoft.config.profile.profiles.resources.ResourcesProfile
 import de.bixilon.minosoft.data.registries.versions.Version
+import de.bixilon.minosoft.util.CountUpAndDownLatch
 
 object AssetsLoader {
 
-    fun create(profile: ResourcesProfile, version: Version, property: AssetsVersionProperty = AssetsVersionProperties[version] ?: throw IllegalAccessException("$version has no assets!")): AssetsManager {
+    fun create(profile: ResourcesProfile, version: Version, latch: CountUpAndDownLatch, property: AssetsVersionProperty = AssetsVersionProperties[version] ?: throw IllegalAccessException("$version has no assets!")): AssetsManager {
         val assetsManager = PriorityAssetsManager()
 
         for (resourcePack in profile.assets.resourcePacks) {
-            assetsManager += resourcePack.type.creator(resourcePack)
+            resourcePack.type.creator(resourcePack).let {
+                it.load(latch)
+                assetsManager += it
+            }
         }
 
         if (!profile.assets.disableIndexAssets) {
diff --git a/src/main/java/de/bixilon/minosoft/assets/AssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/AssetsManager.kt
index 2f130edf0..c84b62384 100644
--- a/src/main/java/de/bixilon/minosoft/assets/AssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/AssetsManager.kt
@@ -20,6 +20,7 @@ import java.io.FileNotFoundException
 import java.io.InputStream
 
 interface AssetsManager : Iterable<Map.Entry<ResourceLocation, ByteArray>> {
+
     /**
      * All namespaces this assets-manager can provide
      */
@@ -37,6 +38,7 @@ interface AssetsManager : Iterable<Map.Entry<ResourceLocation, ByteArray>> {
     val properties: AssetsManagerProperties?
         get() = null
 
+    val loaded: Boolean
 
     /**
      * Returns the input stream of an asset or throws FileNotFoundException
diff --git a/src/main/java/de/bixilon/minosoft/assets/directory/DirectoryAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/directory/DirectoryAssetsManager.kt
index 220a5bb58..1d186c106 100644
--- a/src/main/java/de/bixilon/minosoft/assets/directory/DirectoryAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/directory/DirectoryAssetsManager.kt
@@ -32,6 +32,8 @@ class DirectoryAssetsManager(
 ) : AssetsManager {
     override val namespaces: MutableSet<String> = mutableSetOf()
     private var assets: MutableSet<ResourceLocation> = mutableSetOf()
+    override var loaded: Boolean = false
+        private set
 
     private val ResourceLocation.filePath: String
         get() = "$basePath/$namespace/$path"
@@ -51,11 +53,14 @@ class DirectoryAssetsManager(
     }
 
     override fun load(latch: CountUpAndDownLatch) {
+        check(!loaded) { "Already loaded!" }
         scanDirectory(File(basePath))
+        loaded = true
     }
 
     override fun unload() {
         assets.clear()
+        loaded = false
     }
 
     override fun iterator(): Iterator<Map.Entry<ResourceLocation, ByteArray>> {
diff --git a/src/main/java/de/bixilon/minosoft/assets/file/FileAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/file/FileAssetsManager.kt
index c6c2b132e..64eb5f433 100644
--- a/src/main/java/de/bixilon/minosoft/assets/file/FileAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/file/FileAssetsManager.kt
@@ -21,6 +21,8 @@ import java.io.FileNotFoundException
 import java.io.InputStream
 
 abstract class FileAssetsManager : AssetsManager {
+    override var loaded: Boolean = false
+        protected set
     override var image: ByteArray? = null
         protected set
     override var properties: AssetsManagerProperties? = null
@@ -40,6 +42,7 @@ abstract class FileAssetsManager : AssetsManager {
 
     override fun unload() {
         assets.clear()
+        loaded = false
     }
 
     override fun iterator(): Iterator<Map.Entry<ResourceLocation, ByteArray>> {
diff --git a/src/main/java/de/bixilon/minosoft/assets/file/ZipAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/file/ZipAssetsManager.kt
index e5c00795b..edd0b30be 100644
--- a/src/main/java/de/bixilon/minosoft/assets/file/ZipAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/file/ZipAssetsManager.kt
@@ -29,22 +29,28 @@ class ZipAssetsManager(
 ) : FileAssetsManager() {
 
     override fun load(latch: CountUpAndDownLatch) {
+        check(!loaded) { "Already loaded!" }
+
         val namespaces: MutableSet<String> = mutableSetOf()
         while (true) {
             val entry = inputStream.nextEntry ?: break
+            if (entry.isDirectory) {
+                continue
+            }
             when (val name = entry.name) {
                 "pack.png" -> image = inputStream.readAllBytes()
-                "pack.mcmeta" -> properties = inputStream.readJson()
+                "pack.mcmeta" -> properties = inputStream.readJson(false)
                 else -> {
                     val resourceLocation = name.toAssetName() ?: continue
                     namespaces += resourceLocation.namespace
                     assets[resourceLocation] = inputStream.readAllBytes()
                 }
             }
-            inputStream.closeEntry()
         }
+
         inputStream.close()
         this.namespaces = namespaces
+        loaded = true
     }
 
     constructor(file: File) : this(ZipInputStream(FileInputStream(file)))
diff --git a/src/main/java/de/bixilon/minosoft/assets/minecraft/JarAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/minecraft/JarAssetsManager.kt
index e0599129a..4d2069ed5 100644
--- a/src/main/java/de/bixilon/minosoft/assets/minecraft/JarAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/minecraft/JarAssetsManager.kt
@@ -40,10 +40,14 @@ class JarAssetsManager(
     val profile: ResourcesProfile,
     val version: Version,
 ) : MinecraftAssetsManager {
+    override var loaded: Boolean = false
+        private set
     override val namespaces = setOf(ProtocolDefinition.DEFAULT_NAMESPACE)
     private var jarAssets: MutableMap<String, ByteArray> = mutableMapOf()
 
     override fun load(latch: CountUpAndDownLatch) {
+        check(!loaded) { "Already loaded!" }
+
         val jarAssetFile = File(FileAssetsUtil.getPath(jarAssetsHash))
         if (FileAssetsUtil.verifyAsset(jarAssetsHash, jarAssetFile, profile.verify)) {
             val jarAssets = FileUtil.readFile(jarAssetFile).readArchive()
@@ -100,6 +104,7 @@ class JarAssetsManager(
 
             this.jarAssets = buildingJarAsset
         }
+        loaded = true
     }
 
     override fun get(path: ResourceLocation): InputStream {
@@ -116,6 +121,7 @@ class JarAssetsManager(
 
     override fun unload() {
         jarAssets = mutableMapOf()
+        loaded = false
     }
 
     override fun iterator(): Iterator<Map.Entry<ResourceLocation, ByteArray>> {
diff --git a/src/main/java/de/bixilon/minosoft/assets/minecraft/index/IndexAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/minecraft/index/IndexAssetsManager.kt
index 92d7e0981..f01f6ca8f 100644
--- a/src/main/java/de/bixilon/minosoft/assets/minecraft/index/IndexAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/minecraft/index/IndexAssetsManager.kt
@@ -50,6 +50,8 @@ class IndexAssetsManager(
     private val verify: Boolean = profile.verify
     private val assets: MutableMap<ResourceLocation, AssetsProperty> = synchronizedMapOf()
     override val namespaces: Set<String> = setOf(ProtocolDefinition.DEFAULT_NAMESPACE)
+    override var loaded: Boolean = false
+        private set
 
     private fun downloadAssetsIndex(): Map<String, Any> {
         return Jackson.MAPPER.readValue(FileAssetsUtil.downloadAndGetAsset(Util.formatString(profile.source.mojangPackages,
@@ -77,6 +79,8 @@ class IndexAssetsManager(
     }
 
     override fun load(latch: CountUpAndDownLatch) {
+        check(!loaded) { "Already loaded!" }
+
         var assets = FileUtil.saveReadFile(FileAssetsUtil.getPath(indexHash))?.readJsonObject() ?: downloadAssetsIndex()
 
         assets["objects"].let { assets = it.asCompound() }
@@ -120,13 +124,17 @@ class IndexAssetsManager(
             }
         }
         assetsLatch.await()
+        loaded = true
     }
 
     override fun iterator(): Iterator<Map.Entry<ResourceLocation, ByteArray>> {
         TODO("Not yet implemented")
     }
 
-    override fun unload() {}
+    override fun unload() {
+        assets.clear()
+        loaded = false
+    }
 
     override fun get(path: ResourceLocation): InputStream {
         return FileUtil.readFile(FileAssetsUtil.getPath(assets[path]?.hash ?: throw FileNotFoundException("Could not find asset $path")))
diff --git a/src/main/java/de/bixilon/minosoft/assets/multi/PriorityAssetsManager.kt b/src/main/java/de/bixilon/minosoft/assets/multi/PriorityAssetsManager.kt
index f309b2d41..2889d934b 100644
--- a/src/main/java/de/bixilon/minosoft/assets/multi/PriorityAssetsManager.kt
+++ b/src/main/java/de/bixilon/minosoft/assets/multi/PriorityAssetsManager.kt
@@ -27,6 +27,17 @@ class PriorityAssetsManager(
 ) : MultiAssetsManager {
     private val managers: MutableMap<String, MutableSet<AssetsManager>> = mutableMapOf()
     override val namespaces: MutableSet<String> = mutableSetOf()
+    override val loaded: Boolean
+        get() {
+            for (managers in managers.values) {
+                for (manager in managers) {
+                    if (!manager.loaded) {
+                        return false
+                    }
+                }
+            }
+            return true
+        }
 
     init {
         for (manager in managers) {
@@ -67,6 +78,9 @@ class PriorityAssetsManager(
     override fun load(latch: CountUpAndDownLatch) {
         for ((_, managers) in managers) {
             for (manager in managers) {
+                if (manager.loaded) {
+                    continue
+                }
                 manager.load(latch)
             }
         }
diff --git a/src/main/java/de/bixilon/minosoft/gui/rendering/system/base/texture/texture/PNGTexture.kt b/src/main/java/de/bixilon/minosoft/gui/rendering/system/base/texture/texture/PNGTexture.kt
index 7620034f6..87d3ace61 100644
--- a/src/main/java/de/bixilon/minosoft/gui/rendering/system/base/texture/texture/PNGTexture.kt
+++ b/src/main/java/de/bixilon/minosoft/gui/rendering/system/base/texture/texture/PNGTexture.kt
@@ -22,7 +22,11 @@ import de.matthiasmann.twl.utils.PNGDecoder
 import glm_.vec2.Vec2
 import glm_.vec2.Vec2i
 import org.lwjgl.BufferUtils
+import java.awt.image.BufferedImage
+import java.io.ByteArrayOutputStream
+import java.io.DataOutputStream
 import java.nio.ByteBuffer
+import javax.imageio.ImageIO
 
 
 class PNGTexture(override val resourceLocation: ResourceLocation) : AbstractTexture {
@@ -49,7 +53,22 @@ class PNGTexture(override val resourceLocation: ResourceLocation) : AbstractText
 
         val decoder = PNGDecoder(assetsManager[resourceLocation])
         val data = BufferUtils.createByteBuffer(decoder.width * decoder.height * PNGDecoder.Format.RGBA.numComponents)
-        decoder.decode(data, decoder.width * PNGDecoder.Format.RGBA.numComponents, PNGDecoder.Format.RGBA)
+        try {
+            decoder.decode(data, decoder.width * PNGDecoder.Format.RGBA.numComponents, PNGDecoder.Format.RGBA)
+        } catch (exception: Throwable) {
+            // ToDo: This somehow crashes with some resource packs
+            // exception.printStackTrace()
+            val image: BufferedImage = ImageIO.read(assetsManager[resourceLocation])
+            val rgb = image.getRGB(0, 0, image.width, image.height, null, 0, image.width)
+
+            val byteOutput = ByteArrayOutputStream()
+            val dataOutput = DataOutputStream(byteOutput)
+            for (color in rgb) {
+                dataOutput.writeInt(color)
+            }
+
+            data.put(byteOutput.toByteArray())
+        }
 
         size = Vec2i(decoder.width, decoder.height)
         transparency = TextureTransparencies.OPAQUE
diff --git a/src/main/java/de/bixilon/minosoft/protocol/network/connection/play/PlayConnection.kt b/src/main/java/de/bixilon/minosoft/protocol/network/connection/play/PlayConnection.kt
index 249f5bd9e..b2bba669a 100644
--- a/src/main/java/de/bixilon/minosoft/protocol/network/connection/play/PlayConnection.kt
+++ b/src/main/java/de/bixilon/minosoft/protocol/network/connection/play/PlayConnection.kt
@@ -220,8 +220,8 @@ class PlayConnection(
             version.load(profiles.resources)
             registries.parentRegistries = version.registries
 
-            assetsManager = AssetsLoader.create(profiles.resources, version)
             Log.log(LogMessageType.ASSETS, LogLevels.INFO) { "Downloading and verifying assets. This might take a while..." }
+            assetsManager = AssetsLoader.create(profiles.resources, version, latch)
             assetsManager.load(latch)
             Log.log(LogMessageType.ASSETS, LogLevels.INFO) { "Assets verified!" }
 
diff --git a/src/main/java/de/bixilon/minosoft/util/json/Jackson.kt b/src/main/java/de/bixilon/minosoft/util/json/Jackson.kt
index 411bead5b..b4c9e0c48 100644
--- a/src/main/java/de/bixilon/minosoft/util/json/Jackson.kt
+++ b/src/main/java/de/bixilon/minosoft/util/json/Jackson.kt
@@ -1,5 +1,6 @@
 package de.bixilon.minosoft.util.json
 
+import com.fasterxml.jackson.core.JsonParser
 import com.fasterxml.jackson.databind.DeserializationFeature
 import com.fasterxml.jackson.databind.ObjectMapper
 import com.fasterxml.jackson.databind.PropertyNamingStrategies
@@ -21,6 +22,7 @@ object Jackson {
         .registerModule(RGBColorSerializer)
         .registerModule(ChatComponentColorSerializer)
         .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+        .disable(JsonParser.Feature.AUTO_CLOSE_SOURCE)
         .setDefaultMergeable(true)