I've been noticing this now for the last couple days; and while it could still just be my imagination, I'm starting to doubt that less and less:
Lately when I've gone to check out a thread that I'd viewed previously, and click on "View first unread", it often takes me to several posts past the most recent unread post. In a couple cases, it's even taken me to the next page, when I know that I'd never before seen the last few posts on the previous page.
It's certainly not a major issue or anything, but it is kind of annoying at times. Has anyone else experienced this problem, or is it just me (and my schizophrenic computer)?
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