[doomboy00]

yep had this problem on my laptop to for about 20 minutes. The playerlist doesnt seem to allow other keys to be used even if you set them. So I simply went into
System Preferences>Keyboard and mouse>keyboard

and checked Use F1-F12 keys for custom actions.

This allows the f keys to be used in any application normally, and you hold down the fn key and tap your f keys to do the set actions such as increase the volume, the brightness etc.

If you don't wont to use this method then i dont think there is another way around it. If you find one be sure to post it here so i know of it.

peace,
doomboy00