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The bug is a synchronisation issue.
Basically... the page reloads too fast and the code that marks it read happens in a different transaction.
Either we slow the page down by adding some wait time into reloads that happen after you send a PM.
Or we leave it fast and people get used to it.
Adding
wait
code is really easy... but seems utterly bizarre.We chose to do neither... instead we'll wait and see whether increased traffic on hot servers naturally slows down the pages enough that the issue vanishes without adding cruft.
@Velocio as user7208 wrote, there is great confusion after posting a PM, because of the "1 new message"
There isn't any new messages.