I was running into the same thing on my multi-display setup. My keyboard shortcuts didn't work. I couldn't move clips around. Couldn't for the life of me figure out what was going on. Warm-booted, cold-booted, everything I could think of. I reset PPro's preferences, and still had the problem. I just came across this thread, and sure enough, when I changed the workspace to fit on my main monitor, everything worked. When I changed the workspace back to a multi-monitor setup, the bug was gone. I could do everything I needed to do with the sequence timeline on the second monitor. Go figure. This is definitely a bug. When I close down a project, though, and open another I have to go through the same steps. Super frustrating. PLEASE fix, Adobe! Mac OS Catalina 10.15.7 16gb memory Radeon Pro 460, 4 gb
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