Was having a rummage through the CCC, accidentally triggered something (no idea what.. possibly something to do with Avivo) that has been causing the screen to flicker and occasionally 'shake' whenever a 3D image is brought onto the desktop (movies/games etc), it also does this when alt-tabbing in and out of a game, and has done it during loading screens and even when clicking on different menu options in games. It's kinda like the screen is readjusting or something although nothing actually changes. This is.. unfortunately.. the second time I have done this but I formatted shortly after the last time which solved the problem. I did restore to factory settings, uninstalled and reinstalled drivers, updated from 8.10 to 9.2. To no avail. I'm fairly certain that a format will solve this, but I don't particularly want to do one atm, so if anyone's got any ideas, any feedback would be great. <-- This is on Yorky system btw.