I'm having a similar issue.
Resolve Beta 2
Opened a project this morning. Did some work on the edit. Switched over to Fairlight page and applied some audio ducking. Everything was fine and working as expected. Graded a few shots then saved and shut Resolve down as I went to grab some lunch.
Relaunch resolve and the audio from my clips are all muted (Audio 1 and Audio 2). The music (Audio 3) if fine. There is no way to unmute the tracks. The audio tracks are all set to unmute, the Inspector shows that each tracks has their gain up as does each clip.
If I right click on the clip and select Clip Attributes I check the audio 2 mono channels are shown and both are set to mute, clicking on the dropdown only shows mute as an option.
- Screenshot 2020-11-24 at 15.01.24.png (62.3 KiB) Viewed 3020 times
If I reveal the clip in the media bin and check clip attributes the clip has no audio.
- Screenshot 2020-11-24 at 14.57.21.png (65.8 KiB) Viewed 3020 times
Trying to Relink the file does not work. All that does is causes the clip to go off-line. Only fix seems to be to Replace the clip with itself.