I also had this experience of stalling while listing ID's. I had already set Windows Update to never look for updates. In frustration I opened a command prompt with elevated permissions (start orb, type cmd into the run box, right click on cmd.exe in the list and select run as administrator) when the cmd box opened I typed 'net stop wuauserv' (without the quotes) then pressed enter. Once the service was stopped the listing completed and the updates eventually finished.
I used the above method once the service was stopped I restarted WSUS installer and it worked fine...weird

servocrow