Which version are you now running?
I don't know the answer to your question, but here are a few ideas:
* Have you excluded the alt.binz folders from your antivirus package? Specifically altbinz\misc
* When you lose your queue next time, navigate to the alt.binz misc folder and see how big queue.abz and queue.abz.prevcopy are. It's possible you could make a coy of *.prevcopy, exit alt.binz, copy the back of prevcopy over queue.abz, restart alt.binz and recover your queue.