Ubuntu 10.10 Indicator Applet Session problems

Hi!
I manage our Ubuntu 10.10 at home. Works fine for me, but my wife has a problem - either she has 3 Indicator Applet Session applets on her panel, or none at all. There seems to be no logical (i.e. reproducible) reason for it. No applet means unable to logout (via gnome), 3 identical applets at the same time take up a lot of space and create confusion.

Removing all those applets from the panel, and adding one (1) new one, works. However, if she logs off and then later back on again, there's three of them again... it's weird. And it happens only on her account, not on mine...

It's basically a clean 10.10 installation plus medibuntu. No special gnome updates and upgrades or test installations...

Anyone got a hint how to correct this for good? I.e.. some gnome.conf file or whatever that should be edited, cleaned up or removed?

Eternal gratefulness will be yours if you can help.

Best, Otte