JD the issue is because WGT has been creating these brackets and including rounds played on Cabo and Whistler (since they were made free) The problem is that those two courses are not officially available on the PCEA/Mobile versions of the game so it prevents the brackets from showing up. It has always been like this for the other courses that cannot be played on PCEA/Mobile (unavailable CTTH and Best of's)
WGT needs to start making more Brackets without Cabo/Whistler so that there are more available on the PCEA. Either way this should correct itself at the end of Dec once those two course are no longer available.
As far as the time it takes to get filled, that is probably just a side effect of more and more people switching over to the PCEA and not playing of Flash any more.