I too have this bug on a Lenovo W520 with Ubuntu 16.04 kernel 4.4.0-62-generic
The only solution that has worked is restarting the network-manager service, 
however if I attach an USB WiFi adapter based on rtl8187, the icon becomes 
normal and I can choose a network for that adapter. The Intel Centrino 
Advanced-N 6205 remains unusable.
Also the interface name is wlp3s0 instead of the usual wlan0 on other 
installations I've made.
If I try $ ifdown wlp3s0 results in Unknown interface wlp3s0
As to comment #133 nm-applet still crashes after hardware switching off/on WiFi 
and resuming from suspend.

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https://bugs.launchpad.net/bugs/1589401

Title:
  cannot view wifi networks after re-enabling wifi

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