TAB key behaviour

[Bela Markus]

Hi

pressing the TAB key the currently selected item (for example a desktip 
icon, a whole terminal window, etc.) gets shaded but nothing else 
happenes. CTRL/TAB behaves as a normal TAB. What action is invoked now 
by TAB and how can I set TAB to behave normally?

It is  4.8 compiled from source, running on Tiny Core with Xvesa. Using 
Xorg it works as expected. However Tiny Core by default comes with 
Xvesa. This is related to Xfce 4.8 other applications work normally.

Regards... Béla