Comment 58 for bug 77442

I am also using Ubuntu Jaunty 9.04 and noticing this problem.

So far, the easiest fix I found was to run metacity --replace on the server machine.
This kills the compiz window manager and replaces it with metacity which enables vnc clients to run fine.

I am able to notice the changes at runtime, so changing window manager updates the clients as soons as the command is run.

I hope this helps anyone with this problem.