I just noticed this error that gets print into stdout when I try to save 
changes in menu editor:

X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  20
  Minor opcode:  0
  Resource id:  0x1e00628


Thomas Schlesinger wrote:
quoted text
> Am Dienstag, 29. August 2006 09:16 schrieb Petr Janda:
>   
>> Hi,
>> I just installed kdebase3 and I have problems.
>>
>> 1) Clicking Contol Center in the KDE menu doesnt open control center,
>> but running kcontrolcenter from the shell does open it. I havent tested
>> if its actually usable if ran from the command line, because.... keep
>> reading
>> 2) Menu editor doesnt work at all! Right click on the KDE menu button,
>> try opening the menu editor, nothing happens. Running kmenuedit from
>> command line opens the menu editor, but if I modify anything and click
>> save, it saves it into ~/.config/menus but it doesnt actually appear in
>> the menu. Close kmenuedit, start it up again, and all the entries I just
>> added were gone/didnt appear in the menu editor.
>>
>> It seems that KDE is ignoring ~/.config/menus
>>
>> Any help much appreciated.
>>
>> Petr
>>     
>
> Petr,
>
> KDE 3.5.4 works for me without the problems, you've described. 
>
> Just a shot in the dark:
>
> Create a file /root/.xinitrc with this content:
> startkde
>
> Start the X server via startx and walk through the KDE setup assistant and end 
> KDE after that. Then try again to login via kdm and see, if your problems are 
> gone.
>
> If that doesn't help, create a new user account, and see, if your problems are 
> occuring with this new account, too. If the problems disappear, it seems to 
> be something wrong into your ~/.kde directory.
>
> Thomas 
>
>
>