Since I upgraded to 8.04 I can't do anything on the Gnome panel. The only two options I get when I right click on any panel are About and Help.

No Properties, no Add, no Remove, ...

Any suggestion what might resolve the problem?

On the Launchpad I found a similar case but the guy wanted to remove the panel but had the same problem as me:
But I don't want to remove the panel. I just want my properties back .

lp mk