Some skills like double strike, sweep, deadly bite, maybe some others too, don't work against magic immune creatures. They seem to be classified as spells since you get the "Immune" result when you try to use them. I never saw it in 1.00, looks like this is a new thing in 1.01

 Crushing blow skill doesn't work at all, you execute it, lose your next turn but enemy doesn't take any damage whatsoever without any explanation. I  don't remember if I used it in 1.00 so I'm not sure if it's a new "feature" or not.