One of my Contribute users has been working fine and doing regular updates up until yesterday when he began receiving the access denied/permission problem error. He said he has not changed anything and I have not changed anything. I have checked and all his permissions are still in place. I've tried sending new connection keys and even trying to manually create a connection. We have also uninstalled and re-installed Contribute (CS5). None of my other users are having this problem.
At this point, I don't even know which direction to investigate. Any help would be greately appreciated.