Spec 12 unmix no sound

Hey guys, just got my copy of s12 @40% off $. Thanks Steinberg. Tried my first unmix song parts. Imported three different songs. They import and playback fine. I choose unmix, as I want all the parts. The unmix process happens, but the waveform doesn’t show up. Just a fully black work screen. No sound. I’ve tried muting and unmuting. Still nothing.

anyone have this issue?

Have you tried CPU and GPU unmixing? What hardware do you have? All drivers up-to-date?