Has anyone else's MaxDPS just stopped working all the sudden? I have tried everything to get mine to work and none of my classes are working at all. I have disabled all addons except do it and anything else I can think of and nothing is working.

What has been changed when it happened? There should be some obvious reason. Graphics card drivers maybe? Game folder location? DoIt got to come outdated?
First get sure "DoIt: Class/spec" line appears in chat upon reload.
Then try switching background mode in Assistant settings.
Let us know if something helps.