This problem is application wide, on V1.9.0, downloaded
Firstly, good to see favicons getting into Tiki. Sadly
though, it doesn't seem to be configurable. The boxes
on the General Preferences screen don't actually do
anything, they just return to defaults instead of saving.
A little further digging shows that there's no mention
of favicon in my tiki_preferences table, and no mention
in tiki.sql either. The only place I could find
anything useful was in tiki-setup.php.
Hardly the most earth shattering problem, but maybe one
day we'll see favicons being contributed like styles
are now ;-)