Last week, I’s working on an almost ready Windows Phone project which streams video in SMF (Silverlight Media Framework) Player, for adding some additional features. After the feature integration, I tested it thoroughly in Emulator. To see the app behavior in a real device, I deployed the app on to my Windows Phone 7 device. Bang!!! Nothing is playing. When I try to load video, the player stays still - no audio, no video, not even any video/media related SMF Player events are fired at all. After spending hours of investigation, my colleague pointed out that I haven’t installed Smooth Streaming Client 2.0 on my developer machine.
Installed it, deployed the app to my device. And, Yup! The video starts playing 
Did you ever got stuck for hours for silly issues? 