Found a hint at http://forums.debian.net/viewtopic.php?f=6&t=117788:
sjukfan ( 2014-10-02 08:42)
After an update to GLib in Jessie the other day some/a lot of
program may exit with the message Attempt to unlock mutex that was not
locked. This is because of change in how GLib handles unlocking of non
locked mutex.
So a recompile of the package seems neccesary?
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https://bugs.launchpad.net/bugs/1379713
Title:
Pidgin crashes when pidgin-skype is installed
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