Version details: gnome-base/gnome-2.10-r1
Distribution/Version: gentoo

1. Go to Keyboard Shortcuts
2. Under Sound, select the "Skip to next track" action
3. Hit <Shift><Control>F7

You will see that <Shift><Control>F7 is bound to "Skip to next track". Now the
problem is that only F7 will be bound to that action, not <Shift><Control>F7...
That is, everytime you press F7, the action will be triggered. That also happens
if you press <Alt>F7 (so you can't move the windows anymore with <Alt>F7). This
also happens if you assign, for example, <Shift><Alt>k - it won't trigger when
you press <Shift><Alt>k, but rather when you simply press k.

The same thing happens if you assign a shortcut to "Skip to previous track" or
"Play (or play/pause)", but if you do the exact same thing for "Volume up" or
"Volume down", it works - it only turns the volume up if you press
<Shift><Control>F7 and it doesn't mess up the <Alt>F7 shortcut.