I've had this problem before but I can't remember how to fix it. In Photoshop (and in only Photoshop!), my whites for background and for foreground colour are showing yellow. However, everything else in Photoshop that is white is showing white. So this is just for my TIF files and for the foreground/background colour indication. Any ideas on how to fix this? My Color Settings have RGB set to sRGB IEC61966-2.1 and the TIF file is set to RGB Color Mode.