LOL..................I've been experiencing some "anamolies" using the official kde pkgs, which is why I compiled KDE-3.2.1 from source....................after which these "anomolies" dissapeared..........
It was only after compiling KDE from source I decided to compile QT from source because I found a patch that was supposed to correct a minor bug with an ever-expanding kmenu width.............The patch was for QT-3.3.2, but I modified it for version 3.3.1, applied it to the source and compiled qt........................which gave me the above problem
So, I recompiled QT-3.3.1 without applying the kmenu-width patch............................which gave me the same login problem..........which means the patch didn't cause that login problem...........
Anyway, amos, bottom line for those problems................QT is not the problem but the official Slackware KDE pkgs, therefore I suggest compiling your own Slackware pkgs for KDE.........................Since this is the QT forum, and not the KDE forum, email me (using the email button) if you have any problems compiling KDE and I can supply you with the SlackBuilds scripts I used (which are based on the official SlackBuild scripts)..................there is a definite order for compiling the different KDE pkgs....
BTW..................while this login problem remains a mystery..................I decided to compile the latest QT from source (version 3.3.2) and try that with my KDE-3.2.1 installation.......................and it works!..........................I first compiled it without the kmenu-width patch with success...........................then I recompiled qt with the kmenu-width patch, and it also works...............I used the same configure options, the only difference being the version of qt compiled....................QT-3.3.1 won't let me log in, yet QT-3.3.2 will, after compiling from source.....