On the upfront, openSuSE's upgrade has always impressed me with it's smoothness. While others falter, openSuSE's upgrade process just chugs along and everything is up and running at the end of it. I did the online upgrade with one of my boxes while the other used the DVD method with 11.3 and both went without a hitch.
Along came 11.4 and I did not hesitate based on my past experiences, but boy was I wrong. Right after the upgrade my box booted up to no Xdisplay, no sax2 (wtf ! I know I should have read the release notes, but then no alternatives ?!). The no display I can deal with but the next bit really took me for a doozer. The network did not start up even though it was in runlevel 5. Initially I thought it was because my network card was left un configured but configuration and 6 reboots later did not solve the problem. I resigned myself to a putting 'rcnetwork start' to /etc/rc.d/boot.local.
I did not find other people with the same problem querying uncle google, but for the life of me I can't get it to work. It would just boot up and say that it has reached runlevel 3 or 5 but then I have to manually start up networking using 'rcnetwork start'. These problems really surprised me as openSuSE prior to this has always good to me and upgrades works right from version 10.3 to 11.3 without problems. I guess I got to stop boasting to people how good openSuSE is ... :(