diff --git a/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala b/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
index 02713ee9a..ad4b03409 100644
--- a/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
+++ b/src/main/scala/li/cil/oc/integration/opencomputers/DriverFileSystem.scala
@@ -2,6 +2,7 @@ package li.cil.oc.integration.opencomputers
 
 import li.cil.oc
 import li.cil.oc.Constants
+import li.cil.oc.OpenComputers
 import li.cil.oc.Settings
 import li.cil.oc.api
 import li.cil.oc.api.network.EnvironmentHost
@@ -18,6 +19,8 @@ import net.minecraft.nbt.NBTTagCompound
 import net.minecraftforge.common.DimensionManager
 
 object DriverFileSystem extends Item {
+  val UUIDVerifier = """^([0-9a-f]{8}-(?:[0-9a-f]{4}-){3}[0-9a-f]{12})$""".r
+
   override def worksWith(stack: ItemStack) = isOneOf(stack,
     api.Items.get(Constants.ItemName.HDDTier1),
     api.Items.get(Constants.ItemName.HDDTier2),
@@ -85,7 +88,14 @@ object DriverFileSystem extends Item {
 
   private def addressFromTag(tag: NBTTagCompound) =
     if (tag.hasKey("node") && tag.getCompoundTag("node").hasKey("address")) {
-      tag.getCompoundTag("node").getString("address")
+      tag.getCompoundTag("node").getString("address") match {
+        case UUIDVerifier(address) => address
+        case _ => // Invalid disk address.
+          val newAddress = java.util.UUID.randomUUID().toString
+          tag.getCompoundTag("node").setString("address", newAddress)
+          OpenComputers.log.warn(s"Generated new address for disk '${newAddress}'.")
+          newAddress
+      }
     }
     else java.util.UUID.randomUUID().toString
 
diff --git a/src/main/scala/li/cil/oc/integration/redlogic/ModRedLogic.scala b/src/main/scala/li/cil/oc/integration/redlogic/ModRedLogic.scala
index a762a2f5b..a41a0f7b8 100644
--- a/src/main/scala/li/cil/oc/integration/redlogic/ModRedLogic.scala
+++ b/src/main/scala/li/cil/oc/integration/redlogic/ModRedLogic.scala
@@ -19,7 +19,7 @@ object ModRedLogic extends ModProxy with RedstoneProvider {
   }
 
   override def computeInput(pos: BlockPosition, side: ForgeDirection): Int = {
-    pos.world.get.getTileEntity(pos) match {
+    pos.world.get.getTileEntity(pos.offset(side)) match {
       case emitter: IRedstoneEmitter =>
         var strength = 0
         for (i <- -1 to 5) {
diff --git a/src/main/scala/li/cil/oc/server/machine/Machine.scala b/src/main/scala/li/cil/oc/server/machine/Machine.scala
index 81d62705f..3b0eeffee 100644
--- a/src/main/scala/li/cil/oc/server/machine/Machine.scala
+++ b/src/main/scala/li/cil/oc/server/machine/Machine.scala
@@ -782,7 +782,11 @@ class Machine(val host: MachineHost) extends prefab.ManagedEnvironment with mach
   })
 
   override def save(nbt: NBTTagCompound): Unit = Machine.this.synchronized(state.synchronized {
-    assert(!isExecuting) // Lock on 'this' should guarantee this.
+    // The lock on 'this' should guarantee that this never happens regularly.
+    // If something other than regular saving tries to save while we are executing code,
+    // e.g. SpongeForge saving during robot.move due to block changes being captured,
+    // just don't save this at all. What could possibly go wrong?
+    if(isExecuting) return
 
     if (SaveHandler.savingForClients) {
       return
@@ -1093,4 +1097,4 @@ object Machine extends MachineAPI {
   }
 
   private val threadPool = ThreadPoolFactory.create("Computer", Settings.get.threads)
-}
\ No newline at end of file
+}
diff --git a/src/main/scala/li/cil/oc/server/machine/luaj/LuaJLuaArchitecture.scala b/src/main/scala/li/cil/oc/server/machine/luaj/LuaJLuaArchitecture.scala
index 4ad333ed2..2c8b2388b 100644
--- a/src/main/scala/li/cil/oc/server/machine/luaj/LuaJLuaArchitecture.scala
+++ b/src/main/scala/li/cil/oc/server/machine/luaj/LuaJLuaArchitecture.scala
@@ -231,7 +231,7 @@ class LuaJLuaArchitecture(val machine: api.machine.Machine) extends Architecture
 
     recomputeMemory(machine.host.internalComponents)
 
-    val kernel = lua.load(classOf[Machine].getResourceAsStream(Settings.scriptPath + "machine.lua"), "=kernel", "t", lua)
+    val kernel = lua.load(classOf[Machine].getResourceAsStream(Settings.scriptPath + "machine.lua"), "=machine", "t", lua)
     thread = new LuaThread(lua, kernel) // Left as the first value on the stack.
 
     true