Mutation/Brutal+ queues

I constantly get put in the wrong queue when doing coop. The enabled state of the ‘ready’ button when switching between modes is busted.

Steps to reproduce (among others):

  1. Click Coop, missions
  2. Select brutal+
  3. Click Mutation

Expected result:
difficulty is dropped to Brutal and enabled button lights up

Actual result:
ready button is disabled until difficulty is changed

I played brutal mutation last night then quit starcraft. This morning I launched and clicked ready without making any other changes. It showed the mutation as the selected tab. The game started and it was a brutal+ mission instead of mutation.

This bug has existed since the moment brutal+ was introduced.