Just installed Q2A on a new site and started installing add-ons. Uploaded and extracted the most active users plugin, and admin disappeared. I can still log in and ask and questions, but if i click on the admin link it just say's page not found.
Edit: re-installed Q2A and it did it again..this time i acitvated the badges plugin and admin disappeared.
Edit: re-installed an earllier version of Q2A 1.5.2 and same problem, but found out the problem is with the badges plug in. If i delete it from the server, admin re-appears. Shame because it was goig to be a main feature of my site.