When I have been intersecting entities and attempt an undo, the origionals are missing and an error appears which will close the application when acknowledged.
I seem to remember this happening in 5.06… am I doing something wrong?
What version of RobotStudio are you using, 5.07 or 5.07.01?
Does it happened every time with all entities, or is it some specific entities you have problem with?
I have tried to reproduce your problem in RS 5.07.01, but it works for me.