You need to do really clean and organised programming for media server programming. Play modes and in frame/out frame can really trip you up if you're not careful. A common technique with media server programming if firstly to 'preload' up coming movies on other layers (that's why you have 12 layers, right!).

DMX is a bit pants for media servers - but it's all we have at the moment. Who knows when ACN will be out...

Hugh