Craft Edge

Hi. I am having an issue with my undo/redo button not working in SCAL 5 Pro. I have used SCAL for over 10 years and haven't had much of an issue. I have read all of the threads that I could find about this issue but never saw a clear answer. I've had the Pro version for over a year and I am just now having this issue. I have troubleshooted everything that I could think of myself and I am pretty tech savvy. Can someone please help?

What is the exact version you're using ( and please don't respond with "the latest"). Also, PC or Mac?

And if you start with a fresh file and place a shape from the Library on the mat and drag that shape to a new location and click on the Undo icon at the top, does it go back to its prior location?