Version: (using KDE 3.5.10) OS: Linux Installed from: SuSE RPMs My keyboard (Dell SK-8135) has a volume-control-wheel (connected via global shortcut "XF86AudioRaise/LowerVolume" to KMix). If I keep the left mouse-button pressed and turn the volume-control on my keyboard the keyboard will not accept inputs anymore. I have to log-off and log-on (shutdown is not required) to get my keyboard back working.
Can you check if your problem is related to https://bugs.kde.org/show_bug.cgi?id=171685 . Especially if the workarounds like - left clicking the window icon - opening the window menu make your keyboard respond again.
Sorry i don't work on 3.x problems. That was way before my contributing days :-(.
KDE 3.5.x is gone.