My archery skills, primary skills and JUST my rapid fire are ususable. I have tried binding them one at a time and exiting the skills menu after each one, binding to different numbers/clicks, changing my passive skills, unchecking the option for elective mode, exiting the game completely and logging back in... Nothing seems to matter the UI shows the skills for 4, L-click, R-Click being grayed out and they do not work in combat.
I do not know if getting the punch diablo achievement had anything to do with this bug since I took off most of those skills in order to get the achieve and then logged out right after earning it. I doubt it, but I did see some bug posts regarding the diablo fight and skills glitching.