Default [SOLVED] Tethering activation error

Hi all,

when I installed Android 4.4.2 with the factory image on my Nexus 4 (full wipe, no root, custom recovery) everything was working flawless... but after two week tether stopped to work. When I try to enable it, the phone report an error and also wifi stops to work until next reboot.

Then I found this issue into AOSP Issue Tracker and the solution proposed works!

I simply rooted my device and by deleting /data/misc/wifi directory, after a reboot, the problem is solved (losing all wifi settings). Since I wasn't able to find the same solution here on XDA I want to share the information!
LG Nexus 4 E960
Asus Nexus 7 2013 Wi-Fi