Hm. Chris was working with the code for a while before, but I'm not sure what he did. I'll have to see if he logged anything in the change log.
Is there any chance that the threads have been moved? This can cause problems (if something is moved from Wrestling into Random and the last read stamp you have for that folder is different, you will see stuff repeated)
I've been having no problems, at least none that I can remember with it not working. Unless I just forget that they I marked them and they actually aren't. My life is one big blur right now, yet I still find time to read the forums... awwwwwwwww. :)