Thank you for your post.
I know you said this is intermittent, but I have been running FileMaker Pro 10 on Windows XP (sp 3) and have not encountered this error. Can you be a little more descriptive and provide a real-life example regarding "repainting" or "garbled"? That is, what information is not appearing, what information should appear, etc. Also, are there any Window setting script steps? (Freeze Window, Status Bar, etc.).