I was checking all day waiting for the tickets to come on line. When they did, I wasted about 90 minutes staying late at the office adding tickets to my cart only to get server errors when halfway through the check out process.
I tried again at home, this time using Explorer instead of Firefox, and things went much smoother, though pickings were slimmer. Got tickets to Rowing on 11th, 12th, 13th and 14th, and evening track sessions on 15th, 16th, 17th and 18th, which covered the period I was looking for.
So those that had trouble, what browser were you using? It seems the CoSport website doesn't like Firefox.