I am having the same error! Its very frustrating! Can't seem to solve it..
Did you find a solution. I'm having the same problem.
Count me as another who is dealing with this problem. My client can't log in, receiving the oh-so informative message, "Operation failed. The resource is not a file, or it might be a permission problem." I can log in just fine. Using Contribute CS4. Chatted online with a support rep from Adobe who, after saying he'd attempt to solve the problem, told me to go to adobe.com/support, and come here to the forums. So his solution was for me to fix it myself. Great.
Can anyone help us?