I found solution: http://www.suseforums.net/index.php?showtopic=29436&hl=kdesu
Hi, I use KDE and suse 10.2 linux. I have a problem with kdesu and it is that when even correct password entered, kdesu refuses to run the program and shows the "wrong password entered" dialog. I found the similar problem in the discussion, but there someone upgraded parts of KDE, bud I had not. Do you know what can cause this wrong behavior? Thank you