Disclaimer: This is not a huge problem, just an annoyance.
It seems that part of the recent software upgrade was a facility that highlights certain words in postings. The only word I see highlighted in such a way, for some strange reason, is "op", which if you hover over it says "Original Poster (ie the thread starter)". Why this was done, I have no idea. All I can say is that it's not very helpful; most of the time, this shows up when someone types "op amp", which has nothing to do with the O.P. Perhaps this needs some tweaking?