I can't use any of my F-key shortcuts I've set up when I'm in adjustment curves layer in CS5 x64 on Windows 7. I have a lot of brush shortcuts assigned to these keys I need to access and they no longer work. When I press an F-key, I get the eye dropper tool instead.
Thanks for reporting this. It looks like the function keys automatically activate the targeted adjustment tool in either the Curves or Hue/Saturation adjustment panels. I've gone ahead and logged this in our bug database.