Rhythmbox is located in the sound menu (the tray applet where you monitor volume), however when I click it, it doesn't respond whatsoever. When I open Rhythmbox through Applications > Sound & Video, it loads just fine. The only problem here is that the control buttons are missing from the sound menu applet in the tray (pause, play, forward, rewind). Any fixes?
When in Rhythmbox select
Try changing the value of this drop-down, and see if the control button reappear.
This should influence both the control buttons in Rhythmbox and the tray applet.
After that start rhythmbox and check your preferences under Edit->Plugins, and make sure that
are checked. Then a reboot/logout may be necessary.