Sounds like this known issue: FMPro won't launch in the background Mac OSX
This is one of many acknowledged bugs that can be found in the Known Bug List here in the Report an Issue section of the forum.
It can also be downloaded as a database file from: http://www.4shared.com/file/8orL8apk/FMP_Bugs.html
Yep, that sounds like it. have you come across a fix? I am running FM 11.0 v4 on Lion Server.
If I knew of a fix, I would include it in such posts. Unfortunately, I do not.