This is baffling.
Today I tried to follow the tips in this post to install truecrypt in F11:
Everything seemed chipper. But then I noticed that in the System menu I'm totally unable to launch any of system-config-xxxxx applications. For example, clicking on "Users and Groups" should kick off system-config-users...
But when clicked, I get bupkiss. Okie, so off to Xterm, and just manually type in "system-config-users".... and still bupkiss. It's not that the term is hung waiting for the app to launch, it just immediately dumps to the next prompt without waiting for anything, and without outputting ANYthing to the term to offer a clue to the problem.
But I can launch every one of them if I launch it from the terminal via sudo (for example, "sudo system-config-users")
gnome-system-log performs similarly (unable to launch, immediate exit with no output), but sudo launching and poking through the logs didn't show any obvious errors or problems.