Redirect Loop Error only with Site Admin

Using WPMU 2.9.2 and BP 1.2.3 and BP Fun Theme

The site navigates well if I stay on the front end. As soon as I try to go to the back end into "Site Admin" I get a redirect loop error. I ensured cookies were enabled... that didn't work. Next, I contacted the web server company and they said they couldn't detect any redirects in .htaccess. So now I'm trying to figure out if this is a Buddypress problem or a BP Fun Theme problem.

Please help...

Dave