I thought IgoAvic was Nextgen. It's version 9.18.28.696728.

I reinstalled, made new iGO_Avic dir with content, license and data, and ux.
It created sys.txt. No traffic. I copied working sys.txt. No traffic, same as before.

Now I copied a save folder backup from February, and suddenly the traffic works.
So something bad happened after the installation on this device in February which made traffic impossible, and that state was saved -
but now it is working. I have no idea.

Unfortunately for Luna this trick does not work.