I just upgraded to 4.0 on MacOS 10.15.6 and almost nothing will work

Thank you so much for being so fast with the responses and keeping us updated on the bug fixes. I just updated to 4.0.2 and everything is back to working perfectly. I really appreciate your commitment to keeping all of us up and running with our video production!

@Jason Wexler Thank you so much. It was a very difficult couple of days, and I appreciate you letting me know that the bug fixes have it back to working! (100% of the bugs were due to bugs in the new version of the Unity framework, rather than changes that I made.)

@visualmusicdesign I can also confirm 4.0.2 addressed the sound issue and now all seems well. Thanks for the quick turnaround and great support.

Awesome! So I just tried it out and playback is now working perfectly but I can't get any audio to work. The MIDI is syncing correctly visually with the video, but I can't hear audio from MIDI, Audio, or Video. And actually, if I have the audio turned on for MIDI, then playback stops working again.

Same thing is happening to me as well, no playback sound with MIDI.

Also seeing this problem with 4.0.1 (M1 running Big Sur 11.2.3)