In the last few versions of MC 8.8 (currently on 8.8.5 with Windows 7), I've had the Audio Mixer's pan adjustment knobs disappear apparently on a random, intermittent basis.
I've tried restarting, creating a new user setting, and deleting the project settings and MC State files.
If I import the sequence into another project, the knobs reappear.
Has anyone encountered this before?