I have blocked the "mute" of an audio track and there is no way to unlock it,

Hi Mubo,

Whenever you find that something misbehaves in UI (buttons that do not work, clips overlapping, UI glitches), you should always follow this procedure. You could stop on the step that corrects the issue all go all the way until the end.

1. Save your project!

2. Reset your layout by going to workspaces and choosing reset to saved.

3. Duplicate sequence and ditch the old one.

4. Save as another project (e.g. Project Fix)

If the issue is still there then you have a corrupted project. To try to solve it do the following:

1. Select everything from your timeline and hit copy.

2. Create a new project.

3. Create a new timeline.

4. Hit paste. Your clips will also be imported in the project.

5. Save your project with a new name.