If you do encounter this, please get a backtrace when it happens by attaching a debugger to the running process as RJ described in comment #4. Note that I had to press Ctrl + C in the console I had mixxx running in to get a gdb prompt where I could type "set height 0" then "thread apply all bt". If there is a track playing when this happens, either let the track finish before pressing Ctrl + C or turn off/disconnect your speakers, otherwise you'll hear a horrible buzzing sound when you interrupt mixxx.
If you do encounter this, please get a backtrace when it happens by attaching a debugger to the running process as RJ described in comment #4. Note that I had to press Ctrl + C in the console I had mixxx running in to get a gdb prompt where I could type "set height 0" then "thread apply all bt". If there is a track playing when this happens, either let the track finish before pressing Ctrl + C or turn off/disconnect your speakers, otherwise you'll hear a horrible buzzing sound when you interrupt mixxx.