diff --git a/PrinterCommunication/Io/ProcessWriteRegExStream.cs b/PrinterCommunication/Io/ProcessWriteRegExStream.cs
index 5a256a3f9..105b53b44 100644
--- a/PrinterCommunication/Io/ProcessWriteRegExStream.cs
+++ b/PrinterCommunication/Io/ProcessWriteRegExStream.cs
@@ -62,6 +62,13 @@ namespace MatterHackers.MatterControl.PrinterCommunication.Io
 				return null;
 			}
 
+			// if the line has no content don't process it
+			if (baseLine.Length == 0
+				|| baseLine.Trim().Length == 0)
+			{
+				return baseLine;
+			}
+
 			var lines = ProcessWriteRegEx(baseLine);
 			for (int i = 1; i < lines.Count; i++)
 			{
diff --git a/Submodules/MatterSlice b/Submodules/MatterSlice
index 1dfe0b8e6..8ef196a04 160000
--- a/Submodules/MatterSlice
+++ b/Submodules/MatterSlice
@@ -1 +1 @@
-Subproject commit 1dfe0b8e6a26ee9f336e6340980b34589a8453a9
+Subproject commit 8ef196a04d1ab2ab8d85d14ce9be1c1926a55666
diff --git a/Submodules/agg-sharp b/Submodules/agg-sharp
index 16c87b150..19fdcacb2 160000
--- a/Submodules/agg-sharp
+++ b/Submodules/agg-sharp
@@ -1 +1 @@
-Subproject commit 16c87b150f6ce47a5eeff160b0ced31be6272f12
+Subproject commit 19fdcacb255f5ab8374675bbdf3610ecc71c8a2c