iTunes Playback Black Screen

[Elektrikz]

Hello,

Got my brand new iMac 27 inch yesterday!

Added a mp4 movie to my iTunes Library no problem... The novie will play but I cannot drag the scroller to advance the movie otherwise I only hear audio and see a black screen?

Any ideas?

 

[Elektrikz]

This is driving me insane!

Quicktime also has the same problem on both my iMac & Macbook Pro both fully updated!

Te video starts fine but as soon as I fast forward I get a black screen with only audio???