[TC7.55 b1/b2] Second unpack rar requests password twice

[Schultheis]

If you unpack an encrypted rar file and put this process in the background the next unpack requests the password twice (without error message).

[ghisler(Author)]

This is a known problem, see this thread:
http://ghisler.ch/board/viewtopic.php?t=25922

It has nothing to do with background, it happens every time you unpack a rar with Alt+F9 without entering it.