There appears to be an exploit running on this site. If you navigate to the forum from from Google or yahoo or other search providers. Luckily it looks like what ever file was hosted at the redirect (Filestore) has been removed so there is no immediate danger but looks like its a fairly common exploit and you guys should address it before it gets re-deployed with a working downloader. Could be a left over from the issues you guys had a while back or could be a new attack. It could also mean a second data breach.
http://club.myce.com/f20/vbulletin-myfilestore-hack-find-traces-remove-them-332219/
http://club.myce.com/f20/vbulletin-myfilestore-hack-find-traces-remove-them-332219/