Version:            (using KDE KDE 3.5.5)
Installed from:    SuSE RPMs
OS:                Linux

When I use non KDE applications such as Opera 9.2, OpenOffice 2.2 (both installed from a precompiled rpm), or often also other programs, after a few minutes (sometimes just a minute, sometimes nearly half an hour) these apps don't accept any keyboard input, neither normal charakters, nor key kombinations like STRG-W. Only ALT-F4 to close a window is working the most of the time. Meanwhile I can still control the application with my mouse, so the apps arn't hung up. Only keystrokes are rejected.

Switching with ALT-TAB between open windows sometimes makes the keyboard input work again. 

my system: openSuSE 10.2 on an Acer Aspire 1694WLMI with german keyboard layout

I don't think that the problem is corresponding with the Notebook keyboard, because connecting another keyboard via synergy also produces this problem.