I've been hunting around for a solution to this, so I'm hoping someone here may be able to help.
I'm using KDE 3.5.5.
When I minimise an application, nothing shows on the panel. I have to Alt-Tab to bring up whichever application I want to use rather than clicking the icon on the panel.
Kmenu, my applications and the system tray are all displayed.
Any advice on how to get minimised or open applications to display on the panel?