I've just done a fresh install of 11.1 (KDE) on a Lenovo Thinkpad T500. Icons in the system tray are invisible - the system tray is appropriately sized, and one of the icons seems to be reverse video, and things behave as though the icons were there when I move the mouse over them, but I can't see them....

I did a prior install successfully. Only difference I know of is that this time I did manual configuration instead of automatic.

I've disabled 3d acceleration and restarted X (by logging off/on)...