[MoMan]

I've updated the original post with the latest version of the memcache version of this modification, which uses memcache for both count tracking and thread read times. In the future, I may release the further-improved version which uses memcache only for count tracking.

The non-memcache version of this mod is provided as-is and is not supported. It uses the same queries as the other version, however, so it really should work. I had a look at the code, and saw no problems. There must be something wrong with your forum's read marking- it must not be properly updating the threadread table.