Occasionally when working in photoshop, my keyboard shortcuts will suddenly start functioning in new ways or not at all. When this happens, most of the keys on my keyboard including my tool shortcuts will do nothing (I can't even edit text, though I can select it with my cursor). Other keys will take on new functions (brackets move layers up and down rather than changing brush size, CTRL+D sets feathering for selection area rather than deselecting, etc.) Sometimes, after working with just my mouse for a while, I'll find that the functionality has returned to normal. If this doesn't work, restarting the program seems to always solve the problem. However, this is rather annoying when working with large files that take a while to save/load. I've had this problem on two different computers in two different offices, so I have to assume it's something I'm accidentally doing, but I can't figure it out. Can anyone tell me what I'm doing and how to undo/fix it? Thanks for your help.