mplayer problems after fedup upgrade to F18

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http://forums.fedoraforum.org – All, I had no problems playing video with F17, but after a fedup upgrade to F18, no video playback or DVD play with mplayer. I can open videos and through Firefox. Mencoder and all codecs (gstreamer* and etc) are installed and are the F18 versions, yet I get "codecs needed" dialog boxes when I try to open them. This doesn't seem to be a common problem judging from forum posts and googling it. I'd be grateful for any help. Thanks, Jim (HowTos)