I now use the KDE 4.3 in debian 5 unstable.
I find that klipper does not work for some KDE's application such as kmess and kwrite in my case. When I copy some words in kmess or kwrite, these words will not appear in the klipper, so latter, i am unable to paste these words to anywhere certainly. In the non-KDE application, iceweasel for example, klipper works perfactly instead. I try to turn the klipper off, but the problem still the same. I also wonder that what will take-over the clipboard function after I turn off the klipper? When I turn off the klipper, copy and paste will still work in iceweasel, in the other hand, it is still failed in kmess and kwrite. Does it means the problem is in klipper? Copy and paste are so important in daily use, so I am eager to solve this problem as soon as possible.
Finally, thanks for reading this message!