Oh btw, in the key-bindings.ini, powerSolo should be powerSolo3, I think?
edit:
Just tried survival again, and it seemed stuck on the one power I used at the start (defense). Not a terrible bug, but just an odd one.
hm... or did something change for the main game? The power only reset after the boss fight (guessing that has to do with why the survival doesn't change - only 1 "wave")
edit:
I wonder if the bug with the power was due to the computer I was using didn't have audio ( no speakers plugged in).