The derailleur in the front is not moving the chain up to the big ring. As the chain goes around the middle chain ring, the chain is rubbing on the derailleur cage (looking down from the top is looks like a parallelogram. Please watch this youtube video and it will explain everything. I have watched many videos and this guy explains it very well:

http://www.youtube.com/watch?v=1tQxJ...eature=related

Hope it helps.