If you already set a maximum preference or like to receive unlimited games, then ignore this post. (Non-subs can safely ignore too.)
A long standing issue (unrelated to the site update!) - if your preference is 0 new games (other than buddy challenges) then please set your "Maximum concurrent games" back to zero again
(From My Settings >> Challenge Settings.)
This will finally resolve an ambiguity between choosing zero new games, and unlimited new games.