AH! Well, there's the issue. I can think for a few things, either scan disc is just being stupid (gasp!), or there's something wrong with your ZA installation, causing the log to continually corrupt/appear broken. So, there's the answer to the original question, but I'd say, to be on the say side (if it isn't too much of a pain), reinstall ZA. Let me know if that fixes the problem, will you? If not, I'll do some snooping for you.