...for PMs I've already read. That is, I'll read it, respond and/or delete it, and later navigate away. When I come back, I get a pop up for the same PM, and show "1" unread message under my "notifications" on the top bar. When I go there, it's deleted or marked read, but if I ignore it it will stay like that, and continue to pop up every time I come back to the site. (I'm not on the compy where I don't stay logged in-- I'm on the laptop today. I'm trying to remember whether this started this morning, or late last night. Sorry, I can't. But recently. It was not happening previously when I used this computer.)