This happened to me. I was extremely frustrated. The new update is supposed to have fixed the bug but it did not. The first person I talked to at Adobe couldn’t help, but the second person took control of my computer and did a number of things. The first was exporting the project as an XML and re-importing it. Then he had to reassign all the audio channels to channel one. Then I had to go through all the clips and set the audio volume to 0 as it had reverted back to -infinity. Hope this helps.