Undo is a disaster: Do not use (update: cause found)
At least this is true in beta 9, on Mac OS 11.2.1.
Undo doesn't seem to ever undo the last action. What it will do appears to be almost arbitrary. I've had it shift timeline contents great distances, or delete all timeline contents... and re-do does not work. Therefore you can't recover from the corrupt Undo.
I eventually had to start saving after every consequential action, and use Revert instead of Undo.
Beware.
Undo doesn't seem to ever undo the last action. What it will do appears to be almost arbitrary. I've had it shift timeline contents great distances, or delete all timeline contents... and re-do does not work. Therefore you can't recover from the corrupt Undo.
I eventually had to start saving after every consequential action, and use Revert instead of Undo.
Beware.
