[Spambayes] Spambayes broken

I have been using spambayes with Outlook Express, for a month or so with some success. I then decided to compare it against SpamExplorer. Unimpressed by this product I went back to Spambayes, but I cannot get it to work again. I get the following when I try to "review messages". I have uninstalled spambayes and reinstalled without success. Please help - SpamBayes is good and I want it back. ---------------------------------- 500 Server error Traceback (most recent call last): File "spambayes\Dibbler.pyc", line 470, in found_terminator File "spambayes\ProxyUI.pyc", line 548, in onReview KeyError: '{***HAM***}' ---------------------------