diff --git a/PartPreviewWindow/View3DTransfromPart.cs b/PartPreviewWindow/View3DTransfromPart.cs
index 37d4aa725..a5d86cd4e 100644
--- a/PartPreviewWindow/View3DTransfromPart.cs
+++ b/PartPreviewWindow/View3DTransfromPart.cs
@@ -668,7 +668,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
         private void LoadAndAddPartsToPlate(string[] filesToLoad)
         {
-            if (Meshes.Count > 0 && filesToLoad.Length > 0)
+            if (Meshes.Count > 0 && filesToLoad != null && filesToLoad.Length > 0)
             {
 				string loadingPartLabel = LocalizedString.Get("Loading Parts");
 				string loadingPartLabelFull = "{0}:".FormatWith(loadingPartLabel);
diff --git a/PartPreviewWindow/ViewGcodeBasic.cs b/PartPreviewWindow/ViewGcodeBasic.cs
index f0457e1d8..5aad44aa1 100644
--- a/PartPreviewWindow/ViewGcodeBasic.cs
+++ b/PartPreviewWindow/ViewGcodeBasic.cs
@@ -235,6 +235,7 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
                 renderType |= RenderType.Retractions;
             }
 
+            GCodeRenderer.ExtrusionColor = ActiveTheme.Instance.PrimaryAccentColor;
             gcodeViewWidget.gCodeRenderer.Render3D(0, Math.Min(gcodeViewWidget.ActiveLayerIndex + 1, gcodeViewWidget.LoadedGCode.NumChangesInZ), gcodeViewWidget.TotalTransform, 1, renderType,
                 gcodeViewWidget.FeatureToStartOnRatio0To1, gcodeViewWidget.FeatureToEndOnRatio0To1);
         }
diff --git a/StaticData/PrinterSettings/RoBo 3D/R1/config.ini b/StaticData/PrinterSettings/RoBo 3D/R1/config.ini
index 56ea8ee81..6a59b55f4 100644
--- a/StaticData/PrinterSettings/RoBo 3D/R1/config.ini	
+++ b/StaticData/PrinterSettings/RoBo 3D/R1/config.ini	
@@ -106,7 +106,7 @@ solid_infill_extrusion_width = 0
 solid_infill_speed = 60
 spiral_vase = 0
 standby_temperature_delta = -5
-start_gcode = G28 ; home all axes\nG1 Z5 F5000 ; lift nozzle\nM109 S[temperature] ; set the extruder temp and wait\nM565 Z0 ; Set the probe offset\nG29 ; probe bed\n
+start_gcode = G28 ; home all axes\nG1 Z5 F5000 ; lift nozzle\nM109 S[temperature] ; set the extruder temp and wait\nM565 Z-1 ; Set the probe offset\nG29 ; probe bed\n
 start_perimeters_at_concave_points = 0
 start_perimeters_at_non_overhang = 0
 support_material = 1