The default theme says its Babylon with the babylon picture but its really Smf theme....so better change the thumbbail....
Forum or Board Default
This is the default theme, which means your theme will change along with the administrators' settings and the board you are viewing.
Correctly shows the thumbnail for the "Simple Machines" theme, since that *is* the forum default. The Beta default theme (named "Babylon" here...) id actually *disabled* on this forum, because it has no ad banner.
Edit: For me, I'll check it with a normal user.
-[Unknown]
Yes for us we see the babylon thumbnail.