On Ubuntu 12.04 I use openbox with a single "gnome-panel" started. But after trying to configure my two screen in Xinerama mode I got additional rows of panels each time X restarted.

And despite I completely reverted to my one-screen-X-config

• the gnome-panel displayed has 4 rows (4 at top sreen, 4 at bottom)
• only the outermost row has content, the other 3 are empty
• there is only one gnome-panel process running
• some widgets appear 4 times, too, although they run only once
• when I switch away from openbox using unity I am back to 1 row temporarily

What went wrong here? How do I undo that? Things that did not help:

• rm -Rf .gnome2 .gconf/ .compiz-1/
• pkill panel, and restarting it