Re: 185.19 to 180.44 screwes up WMV, AVI, MPG video playback....
Are you using VDPAU output, or Xv? (ppurka who reports the same issue is using Xv).
Can you try adjusting the brightness/contrast/saturation/hue settings in your video application? Alternatively, do this using nvidia-settings after your video player application has started running.