NO UNDO WHILE MORE THAN 1 PROJECT OPEN ON TW AC13

[archigreen]

When I'm working with 1 project only everything is just fine. The Problem with the "UNDO" not being able is when I'm working with more the 1 project at the same time. Then the second project doesn't allow me to "UNDO"
And it Crashes when I attempt to drag multiple copies of an object.
Does anybody have a clue to find a solution?
Thank you in advance.

[archigreen]

AC 14 is doing great with this issue.
No problems working with multiple projects on TW @ the same time.
Cheers!