Thanks glad you found the area, look forward to the fix as it truly a fantastic piece of software :D

This is still an issue and i have had to use dropbox version history to restore! Hitting CMD + Z on the current tab is inadvertently undoing history in all other tabs which is awful....

Needs to be resolved as this is not good when using it for python packages, then having to trawl through a large amount of version history because of it.