i have had a problem since 13.04 and seems that problem persist to 13.10 too. This problem is described pretty extensive in this thread on Ubuntu Forums and in bug #1179070 on launchpad.
Does anyone of you have any idea what could be? Only can restart nm-applet from terminal but all link seems to be corrupted.
This is the output:
(nm-applet:2478): GLib-CRITICAL **: g_variant_new_string: assertion 'g_utf8_validate (string, -1, NULL)' failed
*** Error in `nm-applet': corrupted double-linked list: 0x098a2738 ***