diff --git a/src/Mod/Arch/ArchComponent.py b/src/Mod/Arch/ArchComponent.py
index d0adea4a47..4ae43b4849 100644
--- a/src/Mod/Arch/ArchComponent.py
+++ b/src/Mod/Arch/ArchComponent.py
@@ -678,15 +678,17 @@ class ViewProviderComponent:
             if obj.Base:
                 if obj.Base.isDerivedFrom("Part::Compound"):
                     if obj.ViewObject.DiffuseColor != obj.Base.ViewObject.DiffuseColor:
-                        obj.ViewObject.DiffuseColor = obj.Base.ViewObject.DiffuseColor
-                        obj.ViewObject.update()
-                        self.onChanged(obj.ViewObject,"ShapeColor")
+                        if len(obj.Base.ViewObject.DiffuseColor) > 1:
+                            obj.ViewObject.DiffuseColor = obj.Base.ViewObject.DiffuseColor
+                            obj.ViewObject.update()
+                        #self.onChanged(obj.ViewObject,"ShapeColor")
         elif prop == "CloneOf":
             if obj.CloneOf and not(obj.BaseMaterial):
                 if obj.ViewObject.DiffuseColor != obj.CloneOf.ViewObject.DiffuseColor:
+                    if len(obj.CloneOf.ViewObject.DiffuseColor) > 1:
                         obj.ViewObject.DiffuseColor = obj.CloneOf.ViewObject.DiffuseColor
                         obj.ViewObject.update()
-                        self.onChanged(obj.ViewObject,"ShapeColor")
+                        #self.onChanged(obj.ViewObject,"ShapeColor")
         return
 
     def getIcon(self):
diff --git a/src/Mod/Arch/ArchSectionPlane.py b/src/Mod/Arch/ArchSectionPlane.py
index a71f125aac..28d24e0998 100644
--- a/src/Mod/Arch/ArchSectionPlane.py
+++ b/src/Mod/Arch/ArchSectionPlane.py
@@ -258,6 +258,7 @@ def getSVG(section,allOn=False,renderMode="Wireframe",showHidden=False,showFill=
         if not techdraw:
             svg += '</g>'
     # add additional edge symbols from windows
+    cutwindows = []
     if cutface and windows:
         cutwindows = [w.Name for w in windows if w.Shape.BoundBox.intersect(cutface.BoundBox)]
     if windows:
diff --git a/src/Mod/Arch/ArchWindow.py b/src/Mod/Arch/ArchWindow.py
index 2d2faca5ef..e19b8f3cda 100644
--- a/src/Mod/Arch/ArchWindow.py
+++ b/src/Mod/Arch/ArchWindow.py
@@ -999,10 +999,12 @@ class _ViewProviderWindow(ArchComponent.ViewProviderComponent):
 
     def onChanged(self,vobj,prop):
         if (prop == "DiffuseColor") and vobj.Object:
-            if len(vobj.DiffuseColor) < 2:
-                if vobj.Object.Shape:
-                    if not vobj.Object.Shape.isNull():
-                        self.colorize(vobj.Object)
+            if vobj.Object.Base:
+                if not vobj.Object.Base.Shape.Solids:
+                    if len(vobj.DiffuseColor) < 2:
+                        if vobj.Object.Shape:
+                            if not vobj.Object.Shape.isNull():
+                                self.colorize(vobj.Object)
         ArchComponent.ViewProviderComponent.onChanged(self,vobj,prop)
 
     def setEdit(self,vobj,mode):
diff --git a/src/Mod/Arch/importIFC.py b/src/Mod/Arch/importIFC.py
index e36882d222..f26ad941d7 100644
--- a/src/Mod/Arch/importIFC.py
+++ b/src/Mod/Arch/importIFC.py
@@ -1750,14 +1750,17 @@ def getRepresentation(ifcfile,context,obj,forcebrep=False,subtraction=False,tess
                             for wire in fcface.Wires:
                                 if wire.hashCode() != fcface.OuterWire.hashCode():
                                     verts = [v.Point for v in wire.OrderedVertexes]
-                                    v1 = verts[0].sub(c)
-                                    v2 = verts[1].sub(c)
-                                    if DraftVecUtils.angle(v2,v1,DraftVecUtils.neg(n)) >= 0:
-                                        verts.reverse()
-                                    pts =   [ifcfile.createIfcCartesianPoint(tuple(v)) for v in verts]
-                                    loop =  ifcfile.createIfcPolyLoop(pts)
-                                    bound = ifcfile.createIfcFaceBound(loop,True)
-                                    loops.append(bound)
+                                    if len(verts) > 1:
+                                        v1 = verts[0].sub(c)
+                                        v2 = verts[1].sub(c)
+                                        if DraftVecUtils.angle(v2,v1,DraftVecUtils.neg(n)) >= 0:
+                                            verts.reverse()
+                                        pts =   [ifcfile.createIfcCartesianPoint(tuple(v)) for v in verts]
+                                        loop =  ifcfile.createIfcPolyLoop(pts)
+                                        bound = ifcfile.createIfcFaceBound(loop,True)
+                                        loops.append(bound)
+                                    else:
+                                        print ("Warning: wire with one/no vertex in ",obj.Label)
                             face =  ifcfile.createIfcFace(loops)
                             faces.append(face)