diff --git a/SkeinPyPy_NewUI/newui/configBase.py b/SkeinPyPy_NewUI/newui/configBase.py
index 0f939de..7f55448 100644
--- a/SkeinPyPy_NewUI/newui/configBase.py
+++ b/SkeinPyPy_NewUI/newui/configBase.py
@@ -125,6 +125,8 @@ class SettingRow():
 		self.ctrl.Bind(wx.EVT_ENTER_WINDOW, lambda e: panel.main.OnPopupDisplay(self))
 		self.ctrl.Bind(wx.EVT_LEAVE_WINDOW, panel.main.OnPopupHide)
 		
+		self.defaultBGColour = self.ctrl.GetBackgroundColour()
+		
 		panel.main.settingControlList.append(self)
 		
 		sizer.Add(self.label, (x,y), flag=wx.ALIGN_CENTER_VERTICAL)
@@ -151,7 +153,7 @@ class SettingRow():
 		elif result == validators.WARNING:
 			self.ctrl.SetBackgroundColour('Yellow')
 		else:
-			self.ctrl.SetBackgroundColour(wx.NullColour)
+			self.ctrl.SetBackgroundColour(self.defaultBGColour)
 		self.ctrl.Refresh()
 
 		self.validationMsg = '\n'.join(msgs)
diff --git a/SkeinPyPy_NewUI/newui/mainWindow.py b/SkeinPyPy_NewUI/newui/mainWindow.py
index 0ea254f..960a0ff 100644
--- a/SkeinPyPy_NewUI/newui/mainWindow.py
+++ b/SkeinPyPy_NewUI/newui/mainWindow.py
@@ -110,6 +110,7 @@ class mainWindow(configBase.configWindowBase):
 		configBase.TitleRow(right, "Filament")
 		c = configBase.SettingRow(right, "Diameter (mm)", 'filament_diameter', '2.89', 'Diameter of your filament, as accurately as possible.\nIf you cannot measure this value you will have to callibrate it, a higher number means less extrusion, a smaller number generates more extrusion.')
 		validators.validFloat(c, 1.0)
+		validators.warningAbove(c, 3.5, "Are you sure your filament is that thick? Normal filament is around 3mm or 1.75mm.")
 		c = configBase.SettingRow(right, "Packing Density", 'filament_density', '1.00', 'Packing density of your filament. This should be 1.00 for PLA and 0.85 for ABS')
 		validators.validFloat(c, 0.5, 1.5)