I don't know if that's a good or bad sign that you were able to see that "fallback" screen.
LOL. I guess that's what I get for being impatient with the KDE updates. Everyone was talking about how great 4.6 was when I was still stuck with 4.5something. I kept waiting and after a week I decided to add the backport. Should have stopped after getting 4.6 (or was it 4.6.1?).
So far I've apparently, from the "last" command, crashed last night (probably when I tried clearing chromium's history and it took the whole system down) and been 'down' about 5 times after Wednesday. I'm wondering now if it's a bad idea to try and downgrade to 4.6.1?
i did notice they did jump quite fast from 4.6.1 to 4.6.2 in the kubuntu backport...wonder if they rushed it and boinked it some how...i've since reinstalled and now back up and running in kde 4.6.2...no problems yet to report.
like i made previous mention, it seems more "stable" and faster, and uses about 100 MB less than it did with just 4.6...you might be better off jumping to natty Kubuntu...