I'm experiencing the same thing. Completely re-installed FM but did no good. Have you any luck with this?
So far, no one has been able to identify the specific cause of this issue, but a few have been able to fix the problem with a completely clean re-install of the OS--which may have eliminate an offending application that conflicts with FileMaker. Can't promise you that will work, but you can read the above threads to know as much as has been determined so far on this issue.