I noticed that every so often Finale 27 will not allow Undo. After I launch the application it works fine. Hard to track when it stops undoing, but usually when I have been working on a piece for a while. It looks like the editing history isn't updating anymore - it keeps showing the same last edit I made. Feels like the buffer is full and instead of pushing the old edits out it says "I'm full". My Undo buffer is set to record 100 steps.