For some unknown reason my pc - which includes laptop and connected stand alone keyboard has suddenly started doing "crazy" antics on screen. Pages will appear and disappear - it seems to be selecting at random pages that do exist on the pc but aren't necessarily being used and just throwing them up and interrupting existing works? - just had an idea whilst typing I do sometimes open up a lot of different sites and forget to close them so they are sitting there either below me or elsewhere and they are often the ones that pop up. Maybe an cluttered pc?? any clues??