Some more housekeeping and a bit of recipe tweakery.

src/main/resources/application.conf

@@ -955,5 +955,15 @@ opencomputers {
       # be loaded. There is also less of a chance of conflicts when running
       # multiple servers or server and client on the same machine.
       nativeInTmpDir: false
+
+      # Due to a bug in Minecraft's lighting code there's an issue where
+      # lighting does not properly update near light emitting blocks that are
+      # fully solid - like screens, for example. This can be annoying when
+      # using other blocks that dynamically change their brightness (e.g. for
+      # the addon mod OpenLights). Enable this to force light emitting blocks
+      # in oc to periodically (every two seconds) do an update. This should
+      # not have an overly noticeable impact on performance, but it's disabled
+      # by default because it is unnecessary in *most* cases.
+      periodicallyForceLightUpdate: false
   }
 }

src/main/resources/assets/opencomputers/recipes/default.recipes

@@ -173,7 +173,7 @@ inventoryControllerUpgrade {
 }
 navigationUpgrade {
   input: [[ingotGold, compass, ingotGold]
-          ["oc:circuitChip3", {item=map, subID=any}, "oc:circuitChip3"]
+          ["oc:circuitChip2", {item=map, subID=any}, "oc:circuitChip2"]
           [ingotGold, potion, ingotGold]]
 }
 signUpgrade {
@@ -427,7 +427,7 @@ rack {
           ["oc:switch", "oc:materialCircuitBoardPrinted", "oc:powerDistributor"]]
 }
 redstone {
-  input: [[ingotIron, "oc:circuitChip2", ingotIron]
+  input: [[ingotIron, "oc:circuitChip3", ingotIron]
           [blockRedstone, "oc:redstoneCard1", blockRedstone]
           [ingotIron, "oc:materialCircuitBoardPrinted", ingotIron]]
 }

src/main/resources/assets/opencomputers/recipes/hardmode.recipes

@@ -358,7 +358,7 @@ rack {
           ["oc:switch", "oc:materialCircuitBoardPrinted","oc:powerDistributor"]]
 }
 redstone {
-  input: [[ingotIron, "oc:circuitChip2", ingotIron]
+  input: [[ingotIron, "oc:circuitChip3", ingotIron]
           [blockRedstone, "oc:redstoneCard1", blockRedstone]
           [ingotIron, "oc:materialCircuitBoardPrinted", ingotIron]]
 }

src/main/scala/li/cil/oc/Settings.scala

@@ -241,6 +241,7 @@ class Settings(config: Config) {
   val alwaysTryNative = config.getBoolean("debug.alwaysTryNative")
   val debugPersistence = config.getBoolean("debug.verbosePersistenceErrors")
   val nativeInTmpDir = config.getBoolean("debug.nativeInTmpDir")
+  val periodicallyForceLightUpdate = config.getBoolean("debug.periodicallyForceLightUpdate")
 }
 
 object Settings {

src/main/scala/li/cil/oc/common/tileentity/traits/TileEntity.scala

@@ -3,7 +3,7 @@ package li.cil.oc.common.tileentity.traits
 import java.util.logging.Level
 
 import cpw.mods.fml.relauncher.{Side, SideOnly}
-import li.cil.oc.OpenComputers
+import li.cil.oc.{Settings, OpenComputers}
 import li.cil.oc.client.Sound
 import li.cil.oc.util.SideTracker
 import net.minecraft.nbt.NBTTagCompound
@@ -29,7 +29,7 @@ trait TileEntity extends net.minecraft.tileentity.TileEntity {
 
   override def updateEntity() {
     super.updateEntity()
-    if (world.getTotalWorldTime % 40 == 0 && block.getLightValue(world, x, y, z) > 0) {
+    if (Settings.get.periodicallyForceLightUpdate && world.getTotalWorldTime % 40 == 0 && block.getLightValue(world, x, y, z) > 0) {
       world.markBlockForUpdate(x, y, z)
     }
   }

src/main/scala/li/cil/oc/server/driver/item/UpgradeNavigation.scala

@@ -18,5 +18,5 @@ object UpgradeNavigation extends Item {
 
   override def slot(stack: ItemStack) = Slot.Upgrade
 
-  override def tier(stack: ItemStack) = Tier.Three
+  override def tier(stack: ItemStack) = Tier.Two
 }