Digital Workshop

Has anyone experienced this problem? Generally, when I edit action lists. copy/paste/undo I get unpredictable results, but nothing I can nail down. For example I tried to create a multi trigger, and then changed my mind. When I tried to undo the change, the original trigger (press any key) changed to (ALT T), which I also used on the list. It's an insidious problem, because you don't always notice it.