Might want to recheck your ubb control panel settings.
Control Panel » Primary Settings-Advanced
Look for referrer check there are two settings.
Then double check:
Control Panel » DB, Paths & URLs
Also a url to your site would be helpful as well as what version ubb you are using.
Edited by Ruben (11/09/11 03:05 PM)
Edit Reason: Added comment
Blue Man Group
There is no such thing as stupid questions. Just stupid answers