This is a funny little bug I found in Painter X, lets see if anyone out there knows if it can be fixed easily, or if I will have to wait for the patch.
Basically when I use a wacom pen button to bring up the brush variant pop-up window, and select a different brush variant (for example: from the digital airbrush to the fine spray airbrush) and draw; the ctrl+z undo command and the zoom in/out commands will no longer regester. I can go through the menus to undo and zoom, but not through the keyboard. If I go back to the original brush variant, I will be able to use the hotkeys again.
Yea, strange as hell. It will do this to me on my machine at work and at home, so I know its not a system issue. Let me know what ya think.