I have the same issue
I have opengoo and joomla installed on same server
when i surf my joomla site no problems
then i surf my opengoo no problem
but after surfing opengoo and then going back to joomla site i get:
This webpage has a redirect loop.
The webpage at
http://www.site.com/ has resulted in too many redirects. Clearing your cookies for this site may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer.
when i dump cookies problem goes away
id=1 is the problem cookie
can can we alert OpenGoo about this and/or edit opengoo/joomla so this conflict goes away?