I just saw the letter icon under my username in orange, indicating that there should be something new in my inbox; but when I went to my inbox there was nothing there I hadn't already read. I wonder if this could be related to the recent trouble with the PM system? I sent a PM the other day and might have gotten a response to it which triggered the colour-the-icon code but not, perchance, the actual display-in-inbox code. Can I get a volunteer to receive a PM from me, or to PM me, and test whether the response shows up in the sender's inbox?