FWIW,
I get this "Mutex destroy failure" message
all the time in KDE under 8.0. However, it doesn't
appear to have any adverse effects on whatever
application may have triggered the message.
Like you, I also first noticed this in 8.0-Psyche.
This is a non-technical response just to say others
Recently I switched to kde from previous wm (enlightenment) and after a few days
of playing with it, I am fairly comfortable. However, there is one new problem
which I had not previously encountered and it does not seem to occur on the 7.3
and 7.2 boxes I have available -- only psyche.
Prior to