I'm using Photoshop CC 2014 in Mavericks. I've tried using the step backward hotkey (command+option+z) and it seems to work fine. Then I use the brush tool and it stops working until I switch to another tool. I'm a digital artist, so I move very quickly while painting, and switching out of the brush tool to step backward on something slows me down terribly. I'll switch and the hotkey works as intended. I've tried changing it to a different set of keys (for example command+z) with the same results. Is this a bug or a feature?