Can't adjust video quality

[twitty]

I go to video settings and there is the green button that can be moved left for best video quality and right for best battery life, in the middle says optimized.  I put mouse pointer on that green button to move it for better video quality and it don't moved.  I noticed the best video and best battery life letters are greyed out (really light grey) and the optimized letters in the center where the green button is, is dark black.  It does not allow me to adjust it, does anyone know how to fix this?  I appreciate it.  

[TomMac]

Try and reboot the base via the power button, attempt to adjust again.