Zoom default hot keys
"z" for zoom... that's fine "Control" for minus zoom is dangerous — "Shift" would be better.
"What happening here, I've done this twice now." Took a bit to get that I was hitting undo.
I'm going to switch over to GIMP from the stuff I'm using. I'll make a few comment on things that are a user moving issue. Like the above. Thing you don't notice so much as you get into a program.
Hope that helps,