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So it seems that a few people are having issues with the SSO service. As of right now I have admin rights in Firefox but not in Google Chrome. (Yes, I dropped all cache and even restarted the browser and re-dropped the cache. Still not recognizing.) Doug Schepers has mentioned that he is having the exact opposite problem; it working in Chrome for him but not Firefox. Honestly, I would love to try and offer some kind of fix at this point but since I have never seen a setup like this before I am lost. :/ Sorry I couldn't be of any more help, but do let me know if you need any testing done that I can do.
I am aware of these issues and am working on resolving them. It's a very complex setup, though, and the heart of the problem seems to be somewhere in the depths of the session infrastructure. Currently I am trying to find a more stable way of sharing information between MediaWiki and Q2A. Will keep you up to date about any progress.
*** This bug has been marked as a duplicate of bug 19390 ***