Do you have a clean install or did you modify anything? Does it only happen with the Hegemon?
Sounds like corrupted install to me. My best bet would be to reinstall the game - you will keep your account data, only game files must be reinstalled.
Let's see if someone with more experience comes up with a better solution
I have no ideas myself, as Mercury said, reinstall the game from scratch, entirely. That way if the install is corrupted, you can 'reset' it and play again.
Usually reinstalls fix this kind of stuff. If it persists, remember to post it in the bug reports thread