Carbide Create (beta 283; 2016-01-15) - Problems? Issues?

Here are few problems I’m having using carbide create. If i hit the undo icon more than 3 or more time the program crashes.
Here’s a big one for me. I have my design and get the tool path. I then save the lay out so i can go back and cut out an exact inlay for the piece i just scooped out. The problem happens when i pull up the saved lay out and find the lay out is different than when i saved it. It’s too bad because i like working in the program, but this is getting to be a deal breaker.