I updated from an older version today and then after than I bought PRO as well. All of my events came over and I am just formatting a few things right now but one issue I have is that when I go in to LIST VIEW it seems to sort by DATE CREATED and not START DATE OF EVENT. The events show up properly in the CALENDAR view but not on LIST.
Also, this website only ever has a single venue and when I look at the list for that VENUE the same issue seems to be happening.
http://lanternchurch.com/events/
I am running WP 3.1.2 and I am using a Theme from Elegant Themes called The Corporation.
I would be happy to email you my login if you wanted to go in there and poke around directly on the site.