messenger lock
Someone else reported this problem. Even my brother saw this but I still didn't see this problem.
Are you using 4.50.312 MerryChristmas? If no, update it and try to reproduce it please.
I sometimes see a program's button on taskbar at start up but as far as I remember clicking on it doesn't open program's window, it only displays a button. I want to ask a question here:
Can you open conversation window by clicking on taskbar button, or do you still have to unlock your Messenger at first to reach that convo?
Edit: Thread has been reported to be moved to Bug Reports forum.
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