I gave up using mc21 on my linux machines...mc 20 works...mc 21 does not...
Clean install linux ubuntu studio 14 and 16...same problem...stops starting up after a while...3 different computers...everything else works perfect, so I am shure it is mc 21 that is causing the problem...
Now I am getting mails for mc 22 upgrade...but why should I upgrade if mc 21 is not working properly...
I think It would be wise to get things working properly before asking people to spend money again for a new adventure...
It works fine in windows...but I do not wish to use windows for my audio...
I'm not sure if is MC problem at all.
I'm running MC 21 on opensuse without problems, same for deepin (based on debian).
Maybe you should post a debug output here to see what happen.
Personally, I'm interested in buying MC, but at this moment, I want to wait to that the "detach display" can move and stay overall windows, is a strange mode for work but I like that (I'm doing it with smplayer actually)
Regards.