I suspect this is related to the OpenGL changes in 2.2.2. Try running mixxx in a console with the "--safeMode" command line argument. If that works, try selecting different waveform renderers in the Waveforms preferences and restart Mixxx without --safeMode. Let us know which renderers work and which do not.
Do you use the proprietary nVidia driver or nouveau?
I suspect this is related to the OpenGL changes in 2.2.2. Try running mixxx in a console with the "--safeMode" command line argument. If that works, try selecting different waveform renderers in the Waveforms preferences and restart Mixxx without --safeMode. Let us know which renderers work and which do not.
Do you use the proprietary nVidia driver or nouveau?