Here’s an interesting resolution I came across the other day that I thought might help some of you in case you run into the same thing.  My customer was running Windows 2003 Server and after an upgrade from WSUS 2.0 to WSU 3.0, when they tried to approve an update in the WSUS 3.0 console it would hang and an hourglass would appear. Even after waiting for a while it was still just hung there with the hourglass.  We checked the version of the MMC being used and found that it was 5.2.3790.3959 so we tried installing KB942213 and sure enough it resolved the issue. This KB is titled The MMC.exe program randomly becomes unresponsive when the user clicks OK or Cancel several times to close a Windows form in Windows Server 2003 and the reason I’m mentioning it here is because the article doesn’t specifically mention WSUS so if you’re using that as a search term you may not see it.  And to add to that, we also had to give Full Control for the NetworkService account in: - C:WINDOWSrepair - C:WINDOWSMicrosoft.NETFrameworkv2.0.50727CONFIG - C:WINDOWSMicrosoft.NETFrameworkv2.0.50727Temporary ASP.NET Files If you run into an issue where the MMC just seems to hang for no reason then you might give this a try.