I can confirm this bug for 6.06 too: xfce4-panel disappears, and sometimes looses some icons, or the xfce-menu entry.
It doesn't seem to depend on an user-interaction. Sometimes I go to sleep and the panel vanished overnight without any interaction.
It started in summer 2007, and is appearing more often since then.
I use mostly the fglrx-driver for my graphics card, and I'm unsure whether it happens with the radeon driver too.
I can confirm this bug for 6.06 too: xfce4-panel disappears, and sometimes looses some icons, or the xfce-menu entry.
It doesn't seem to depend on an user-interaction. Sometimes I go to sleep and the panel vanished overnight without any interaction.
It started in summer 2007, and is appearing more often since then.
I use mostly the fglrx-driver for my graphics card, and I'm unsure whether it happens with the radeon driver too.