I'm pretty confused, too... I had similar problems with different versions of qt and xlib, when trying to upgrade to KDE 3.1.2 (from 3.1.1; pretty silly, I know . I wanted to get ksplashmanager (www.kdelook.org) to work, and though upgrading it would solve my problem). It didn't work at all (every single window seems to try to be as wide as possible, and no text in KDE ).

I had to reinstall Knoppix; closer inspection reveals that Kdevelop and koffice is up-to-date enough not to bother. What a mystery... I suspect that Knoppix's KDE++ was compiled using non-standard qt libraries. Caveat: I've only started using Linux two weeks ago, so my guess is probably off the mark.

Good luck, though. It's fun, but it's very tough.