This is killing me.
I can't click and drag anything. No selection tool. No pen.
I tried the magic keys to reset the interface settings, and that doesn't work. I'm good at Googling, and I couldn't find anything. Any ideas?
have you got auto select layer unchecked or is the layer locked?
Nope! I have homework due, so I just went on a mad uninstall spree. I uninstalled Gmote, Spotify, Macrokey Manager (whatever the hell that is) and a Wubi Ubuntu Install. The latter was probably unnecessary-- my money is on Gmote or MacroKey Manager.
Either way, it works now. Didn't even have to restart Photoshop.