diff --git a/src/net/torvald/terrarum/DefaultConfig.kt b/src/net/torvald/terrarum/DefaultConfig.kt
index b2df63eeb..a0eed89f3 100644
--- a/src/net/torvald/terrarum/DefaultConfig.kt
+++ b/src/net/torvald/terrarum/DefaultConfig.kt
@@ -25,7 +25,7 @@ object DefaultConfig {
         jsonObject.addProperty("language", AppLoader.getSysLang())
         jsonObject.addProperty("notificationshowuptime", 4000)
         jsonObject.addProperty("multithread", true) // experimental!
-        jsonObject.addProperty("multithreadedlight", true) // experimental!
+        jsonObject.addProperty("multithreadedlight", false) // experimental!
 
 
 
diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
index 5b8077755..924c592e8 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/BlockBase.kt
@@ -4,8 +4,8 @@ import net.torvald.terrarum.Point2d
 import net.torvald.terrarum.Point2i
 import net.torvald.terrarum.Terrarum
 import net.torvald.terrarum.gameactors.ActorWBMovable
-import net.torvald.terrarum.gameworld.GameWorld
 import net.torvald.terrarum.gameitem.GameItem
+import net.torvald.terrarum.gameworld.GameWorld
 import net.torvald.terrarum.itemproperties.ItemCodex
 import net.torvald.terrarum.modulebasegame.Ingame
 import net.torvald.terrarum.modulebasegame.IngameRenderer
@@ -26,6 +26,7 @@ object BlockBase {
         val mouseTile = Point2i(Terrarum.mouseTileX, Terrarum.mouseTileY)
 
         // check for collision with actors (BLOCK only)
+        // FIXME properly fix the collision detection: it OVERRIDES the tiki-torches which should not happen AT ALL
         if (gameItem.inventoryCategory == GameItem.Category.BLOCK) {
             var ret1 = true
             ingame.actorContainerActive.forEach {