This is happening on an Nvidia GT 330M 1GB. I updated to the latest drivers and it is still doing it. There seems to be some relevant information in the log so I will post it here.
6/3/2012 7:19:51 PM Thread exception: SlimDX.Direct3D9.Direct3D9Exception: D3DERR_DEVICELOST: Device lost (-2005530520)
at SlimDX.Result.Throw[T](Object dataKey, Object dataValue)
at SlimDX.Result.Record[T](Int32 hr, Boolean failed, Object dataKey, Object dataValue)
at SlimDX.Direct3D9.Device.Present()
at FourDO.UI.Canvases.SlimDXCanvas.Render()
at FourDO.UI.Canvases.SlimDXCanvas.SlimDXCanvas_Paint(Object sender, PaintEventArgs e)
at System.Windows.Forms.Control.OnPaint(PaintEventArgs e)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.UserControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
6/3/2012 7:19:51 PM Thread exception: SlimDX.Direct3D9.Direct3D9Exception: D3DERR_DEVICELOST: Device lost (-2005530520)
at SlimDX.Result.Throw[T](Object dataKey, Object dataValue)
at SlimDX.Result.Record[T](Int32 hr, Boolean failed, Object dataKey, Object dataValue)
at SlimDX.Direct3D9.Device.Present()
at FourDO.UI.Canvases.SlimDXCanvas.Render()
6/3/2012 7:19:52 PM Thread exception: SlimDX.Direct3D9.Direct3D9Exception: D3DERR_DEVICELOST: Device lost (-2005530520)
at SlimDX.Result.Throw[T](Object dataKey, Object dataValue)
at SlimDX.Result.Record[T](Int32 hr, Boolean failed, Object dataKey, Object dataValue)
at SlimDX.Direct3D9.Device.Present()
at FourDO.UI.Canvases.SlimDXCanvas.Render()
6/3/2012 7:19:52 PM Thread exception: SlimDX.Direct3D9.Direct3D9Exception: D3DERR_DEVICELOST: Device lost (-2005530520)
at SlimDX.Result.Throw[T](Object dataKey, Object dataValue)
at SlimDX.Result.Record[T](Int32 hr, Boolean failed, Object dataKey, Object dataValue)
at SlimDX.Direct3D9.Device.Present()
at FourDO.UI.Canvases.SlimDXCanvas.Render()
That last smaller section just keeps repeating.
other specs
core i7 Q720
6GB RAM
Win7 64bit
I haven't been using 4DO on my other nvidia video card machine to know if it is happening on there yet. I am just kind of throwing this out there to see if others are noticing this at all. I also do not have any scale mode filters enabled so it might rule out the filters themselves, but could be something in the other changes for the filters.