1) panel disappears and it can be restored
(alt+f2, xfce-panel, enter - then reboot saving preferences)
2) panel disappears and it CAN'T BE restored
This second problem is quite annoying
I solved it out by reinstalling from the synaptic pack manager anything that had to do with the panel (by searching with the tool), and then using the solving process 1) after the reinstallation.
I'm not in CS, i don't know what i've done but i have my panel back. Hope it works for you too
I HAVE THE SOLUTION
From my point of view,
WE ARE TALKING ABOUT TWO DIFFERENT BUGS
1) panel disappears and it can be restored
(alt+f2, xfce-panel, enter - then reboot saving preferences)
2) panel disappears and it CAN'T BE restored
This second problem is quite annoying
I solved it out by reinstalling from the synaptic pack manager anything that had to do with the panel (by searching with the tool), and then using the solving process 1) after the reinstallation.
I'm not in CS, i don't know what i've done but i have my panel back. Hope it works for you too