Comment 22 for bug 965953

@Ian Lane:

The issue happens only when the panel is at the bottom, not at the top. The issue also most frequently happens with Skype, but also sometimes with other applets such as network-manager or dropbox. It appears particularly after the menuitems in the menu change, such as when a new Wireless network has been detected or the network adaper looses/gains a connection. Try pulling the network cabel from your notebook and the network-manager menu will collapse to 0px height. After that only a restart of the applet can fix the issue.