Sometimes as i work on an image in it suddenly changes tohuge solid blocks of one or two colours and once this has happened, any image Iopen from bridge opens with the same problem. If I grab the title bar with themouse and drag the image a little the image reappears but as soon as I let gothe mouse the blocks come back. I can fix this by closing down CS5 andreopening but this is becoming a nuisance. It happens with psds and jpegs. Ihave run this software for 2 years with no problem until recently. I have thelatest updates of CS5 and graphics card (AMD Radeon HD6450). I have also trieddeleting the preferences file in case it was corrupted but this made nodifference. Help....please.