The Forum database had a hiccup and lost track of internal counters in one of the tables for a few hours this afternoon. The effect would be the inability to post new threads. Posting to existing threads was working OK, though.
Anyway, if you tried posting a thread after about noon today Central time, try your thread post again, if you haven't already done so. It should be working now.
Apologies for the inconvenience.
Tom
Bookmarks