I have been experience some weird behaiviour in forum, I use it together with a sql server 2005 server and lately I have been forced to run the "check installation" option beacuse all the css styles have disapered and I can't access any of the forums, but every time I run the "check installation" agin the forum is back to normal again. Have anyone experienced this behaiviour?
The problem is on the web server, and it usually means that the site or server may have been reset. If that happens too often, you should contact your host and tell them that your application is losing its application variables values too often and ask them why that is happening.