After the UI, that was the first place I looked. Browsed every file with a .log suffix, but did not find anything.

But just now - thinking I must have missed something - I went back to C:>Windows>Program Data>Avast Software>Avast to look again and, guess what?.. There is no “log” directory. Screen snap: http://tinyurl.com/m3upg9r

Now I’m wondering if my mind is slipping…