Yesterday, I was about to install a couple of updates when I realized that they'd force me to restart. So I closed out Software Update and went along with my business. I also decided to change the short name of my account, as I took over my brother's and wanted to change it. Today, I saw that iTunes 9.1 had come out and ran Software Update and lo and behold, Software Update stalls with nearly no progress and hops around the dock. I switched to Software Update and it tells me: "Software Update can't check for updates because of a network problem." and under that "Software Update can't connect to the update server. Make sure you're connected to the Internet, and then try again." Well I'm a bit confused, since I was wasting my life away on facebook in the Safari window next to Software Update, but I clicked the button that ran Network Diagnostics, which told me my internet connection was fine. I tried it again and it didn't work. I repaired disk permission and it didn't work. I cleared out the .plist files that someone on the Apple support forum had been told to delete by an Apple support person. Nothing's worked. I even tried creating a new account that had the same properties as the account before I changed the shortname and Software Update didn't work on there either. I'm at 10.6.2 and always greet my MacBook with a smile in the mornings, so I don't know why it's acting up like this. Any help would be appreciated.