"Sometimes, though, my Internet connection, which was configured to start at boot, wouldn't be started."
The problem is with the sysconfig package. It worked fine with the default package from the 10.3 DVD. The problem starts when you either update sysconfig via official suse update repo or upgrade to 11.0. What ever the bug, it's related to the sysconfig package. I've all ready submitted a bug report here. https://bugzilla.novell.com/show_bug.cgi?id=402438