[Klyde]

Ok. Being unsteady in the hands at times, once in a while on a fluke with a hand spasm, my objects get smashed together, and a 3d surface becomes a flat surface, or my fingers click the mouse button at the wrong moment and hit a random button. Mayhaps not that this is your problem, just relaying something that happens to me. I would open the past file, re-do the modifications( hate that when I have to do this) and then resave the file, close it and re-open it and see if it is acting right.