I am having a very similar problem after the upgrade. If I reboot the server and start VC everything is fine, but when I check it later in the day I get the message that it can't connect to the server and it asks if I'd like to retry. If I select yes it just keeps saying it can't connect. The only thing that fixes the issue is a reboot and it's only temporary. I tried the 10.0 beta as well and I'm seeing the same problem.