Node Refresh problem

Hi,

When in B 2.57 I seem to have a problem with the compositing nodes.

They do not refresh or render anymore untill i disconnect and reconnect the wire in between. Is that suppose to happen?
I attached the file.

Problem 1: Move the little cylinder and nothing happens in the node editor until i re-connect it.
Problem 2: Somehow the two nodes will not mix
Problem 3: It renders only the render layer and not images

Not an nodes expert, but i had it working before, doe i have a major setup wrong somewhere?
Any suggestions?

Attachments

Node_Problem.blend (477 KB)