Just started using CS4 and discovered that the shortcuts to toggle between the RGB channels in Levels has changed! This is very frustrating. I have been using the same shortcuts for years. Is there any way to customize them?? I don't see anything listed for this in the Keyboard menu dialogue box. I actually have an application installed (Menu Master) which enables me to customize any menu in any application...well, I changed the ones in the Levels dialogue box, and now NONE of those shortcuts works at this point.