From Bugzilla Helper:
User-Agent: Mozilla/4.72 [en] (X11; U; Linux 2.2.18-dsp1 i686)


(I first downgraded glibc from the broken i686 version to i386 to ensure
this is not a glibc or kdm problem.)

The first time a user (root or otherwise) starts KDE (from gdm or kdm in my
case), the tri-color "starting KDE" progress dialog box appears, and
part-way through initialization the X server suddenly exits and returns to
the login prompt.  Successive logins as the same user are successful, but
if I recreate the user's home directory from /etc/skel, the problem happens
once again at the next login.

Reproducible: Always
Steps to Reproduce:
- Create a new user, or replace an existing user's home directory with
contents of /etc/skel.
- Login as that user and start KDE.
- After the crash and second login attempt, KDE starts successfully.