I understand how frustrating stuff like this can be.
A problem I've been having is that when I click on the 'new posts' icon in front of a thread (which is SUPPPOSED to take me to the newest post), I often (but not always) am taken to the first post again. OR a thread with no new posts is labeled as having new posts.
I've asked for help with this in the forum for technical support, but got no answer from SNM. It did seem to help for a short time when I would log out every time I left, as another forum member suggested, but that didn't stick as a fix.