Hm, I've never actually heard of this problem, specifically.
You could try uninstalling/reinstalling FH, to make sure it's not some corrupt file that's causing the game to kick you out when you do that, but I'm not sure.
You may want to give that a try, but if all else fails, then PM a mod/admin about the issue. Either give them a link to this thread or just explain your issue.
I hope you get this figured out, Zombiekitteh. o: