Problem With Altgr key, can not type |, @, ~

[Oleg]

Dear all,
after upgrading Debian to Sarge the AltGr key stop working properly. I 
am using German Keyboard. I can not get |, @, ~ symbols. This only 
happens in KDE. In terminal everything works fine. I tried to choose 
different keyboard layouts in Control Center but it did not help.
I have this problem on my Notebook and PC both running Debian Sarge.
Thanks a lot in advance