Today FileMaker Server 11 Advanced failed to start on my iMac running OS X 10.5 (it’s my developer server). I could launch the admin console and click the start button, but nothing would happen. The FMS command line was no help either.

Fortunately I have an archive of email from the fmpexperts mailing list. A year-old post from Stephen Wonfor (thanks, Stephen!) provided the answer, which was contained in this link:
Terminal Tips: Rebuild your Launch Services database to clean up the Open With menu

I downloaded the free utility Maintenance, ran it, and chose the rebuild LaunchServices option. Problem solved!