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0e1f616
(Get the code!)
I've seen this too since I upgraded from 11.10 to 12.04 (never experienced this prior to 12.04). I would add that it is not just the VPN Connections submenu that stops working; it's any entry in the applet's menu that stops working. When this happens, the workaround that I use is:
kill -1 `pidof nm-applet`
nm-applet &
I usually see this problem after several suspend-resume cycles while commuting between home and work. It could have something to do with new wireless networks being detected so it is probably not the suspend-resume cycles themselves but the constant scanning and discovery of wireless networks that is associated with suspending the machine in one place and then resuming in some other place. I can try to run with wireless disabled (via the nm-applet option for this) for a few days to see if the problem reoccurs.
I've read about previous memory leaks in nm-applet possibly causing this but I have been monitoring memory utilization of the nm-applet process and I have not noticed a huge utilization when the applet is in an unresponsive state.
If anyone finds the master bug please lets us know so we can subscribe to it.