I have no idea why, but for some reason my Tab button stopped doing anything it is supposed to. In every program it just de-selects whatever I am doing, like if I clicked off onto my desktop. the only recent software change I have made was installing Blur, and I don't think that has anything to do with it. If you need my hardware specs please ask, but I doubt that they are necessary. any help will be much appreciated. Update: Sorry everyone, but apparently my alt key was stuck. I couldn't see that it was stuck because they key actually came off and looked like it was sitting properly. dumb mistake, sorry!