I'm experiencing this same problem. I use the applet to connect to an openconnect vpn. I just rebuilt it to try to get a proper stack trace (debug symbols don't appear to be available in the Debian archives), but now it dosn't seem to reproduce. Maybe a dependant library changed and didn't bump a sover or something? I'll keep it running in the debugger in case it does decide to reproduce...
-- [ ch...@chiappa.net | chris.chia...@oracle.com ] [ http://www.chiappa.net/~chris/ ]