I have the same problem as above, but for me the solution doesn’t work, unfortunately.
I updated to version 3.1.20 too, have a childtheme too, and only see a list too.
Looks like it does not see (the css of) the childtheme, because the parenttheme works fine (but then i don’t see the additional changes i made).
I already put the above sentence
add_filter(‘tc_include_cpt_in_archives’ , ‘__return_false’ );
in my functions.php.
Warm regards,
Janneke