diff --git a/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs b/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
index 9e0eb2da6..d7c704d63 100644
--- a/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
+++ b/MatterControlLib/SlicerConfiguration/EngineMappingsMatterSlice.cs
@@ -313,7 +313,7 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 				{
 					if (!firstExtruder)
 					{
-						mergeRules += ",";
+						mergeRules += "E";
 					}
 					mergeRules += AddObjectsForExtruder(itemsByExtruder[extruderIndex], holes, outputOptions, ref savedStlCount);
 					firstExtruder = false;
diff --git a/Program.cs b/Program.cs
index 567813325..2b073bc24 100644
--- a/Program.cs
+++ b/Program.cs
@@ -223,8 +223,12 @@ namespace MatterHackers.MatterControl
 			config.Bind("Agg:ProviderTypes", AggContext.Config.ProviderTypes);
 			config.Bind("Agg:GraphicsMode", AggContext.Config.GraphicsMode);
 
+#if DEBUG
+			Slicer.RunInProcess = config.GetValue<bool>("MatterControl:Slicer:Debug", true);
+#else
 			Slicer.RunInProcess = config.GetValue<bool>("MatterControl:Slicer:Debug");
-			Application.EnableF5Collect = config.GetValue<bool>("MatterControl:Application:EnableF5Collect");
+#endif
+            Application.EnableF5Collect = config.GetValue<bool>("MatterControl:Application:EnableF5Collect");
 			Application.EnableNetworkTraffic = config.GetValue("MatterControl:Application:EnableNetworkTraffic", true);
 
 			// Make sure we have the right working directory as we assume everything relative to the executable.
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index 5e8df4758..3e48ee30a 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit 5e8df4758b20789a14a54801c176717da9465275
+Subproject commit 3e48ee30a5a4ab9ad10c74be5526a513dad92983