Seems to have quit.

For the past week, my copy of Spam Sieve seems to have stopped working.
I’ve upgraded to 2.6.6 and that’s the version I open.
I still have thousands of corpus rules listed. I continually train the program with more spam. But it is picking off no spam on its own.
Any suggestions?

If it suddenly stops working, that’s probably because of a change in your mail program’s setup or because of a corrupt file. Please see this page.