My staff and I have struggled with the "undo" feature in proclaim for a long time, which lead us to give up on proclaim having a working undo option. It was only this week that I realized why we were having such problems. We all had mistaken the "Reset Customizations" icon for an undo button. Now it seems obvious why anytime we hit undo it destroyed the whole slide.
So I would suggest changing the icon for "Reset Customizations." The icon that is there currently is really more of the universal undo icon, and looks almost identical to the undo button in MS Office. We can't be the only ones to have made this mistake.
I am attaching a mock-up I threw together for what I would suggest better conveys the idea of "Reset Customizations" and doesn't look like a standard "Undo" button.
Hope this helps others who have made the same assumption about the undo functionality, which now works great!