Any video I try playing will lock up MC. When I try to open a video file I get the spinning wait symbol that never goes away and I get an empty white box that will stay on top of any other program until I force quit MC. I have tried avi, mkv, and mp4 files. I've tried from the MC's File > Open Media File menu as well as from Open With in Finder. Audio files play fine. Videos play fine in VLC. I'm on the latest version of MC and I don't know when this started as MC isn't my default video file handler.
I tried removing MC from my computer and reinstalling it but that didn't help.
MC 21.0.80
OSX 10.11.4
EDIT: Okay, this time I waited it out. After I got the blank screen and hour glass I walked away for a few minutes. When I came back the video was playing. It seems that once the file has been loaded/played, MC works well. If not, it chokes for a couple of minutes until it does whatever it does to get it to play.