Yesterday, Photoshop CS4 started acting weird and I decided that instead of trying to fix it for hours on end I would just buy CS5 because it was time to upgrade anyway. The problems persist though, I'll just list the things that are wrong. First off, I have to click File->New (or Ctrl+N) 3 or 4 times to bring up the new document menu. When I hit create, the new document menu disappears like normal but no new document is created. I tried that a few times but failed to create a new file each time. After a few attempts, I was able to open a file by dragging it into photoshop. When drawing with the brush I noticed some odd behavior. Sometimes It would makes the stroke as I held down the mouse like normal, but when I released the stroke would disappear. Other times it would not appear at all, and once I was able to make a stroke. I have no conceivable idea what's wrong with photoshop. I hadn't been playing with the settings and I like the stickied topic suggested, I deleted the preferences and purged, restarted photoshop, nothing worked. I'm banging my head on my desk here :banghead: If anyone has any idea, I would greatly appreciate.