Almost every time I unlock my computer the networking icon and the Bluetooth icons are missing from the panel. They also disappear if I disable networking with the 'hardware switch', even though before they would just switch to a 'disabled' look. I know I can get the networking one back by running nm-applet, but I'd rather just find a way to make it stop disappearing. What causes this?

This is on 12.10 64-bit, if it matters.

UPDATE: I ran it from terminal, and got this:

$ nm-applet
** Message: applet now removed from the notification area
** Message: PID 31340 (we are 28924) sent signal 15, shutting down...

And then it exited. So it thinks it's supposed to quit...? I haven't been able to figure out what process had that ID.