I have not experienced it. Drat - I hope you can nail it down and I'll keep an eye out for it.
Filemaker Pro 11 Advanced
Windows XP Professional SP2
Thank you for your post.
I know these intermittent problems are difficult to narrow down, but the next time this occurs, please write down (what you can remember) the steps taken just prior to this occurring. If I get a number of these posts with some commonality, perhaps the cause will be discovered.