I have installed a YetAnotherForum (http://tosharemusic.com). It was working fine, not too much users or visitors. But suddenly it showed the error “This SqlTransaction has completed; it is no longer usable.” I had a search and put a ticket to my hosting after more than 30 minutes NO RESPONSE. yeah it is http://reliablesite.net . So just tried to check what is wrong once again, I saw the log file was so big and I just truncated the files and yes it is working fine. So this may be a help for those who are using reliablesite as their hosting, but may be this will be your issue also, so just take a look.

At last I got a reply from the hosting site, after nearly 3 days. They says it is working fine which everybody knows.