Hi all,
Had to reinstall 11.4 KDE 64 bit last weekend.
This morning I upgraded from the default KDE (that comes with the 11.4 DVD) to KDE 4.6.3.
On rebooting I am unable to login, after I enter my password the screen flickers, then I am presented again with the logon screen.
Any ideas what the problem could be?
Thanks for any advice 
When you are at the logon screen look in the lower left corner for the DE and select KDE failsafe. This should cure your problem.
More likely you need to select the session: kde-plasma-desktop, from the session options at the login screen.
Hi caf4926,
Selecting ‘kde-plasma-desktop’ from the session options sorted me out 
Many thanks to all who lent an ear :-p
That did for me too - I thought it was a password problem and went in the wrong direction 