Update: downloaded 1.8.3b from the downloads page. I am no longer getting the errors spammed at me, but my marquee is still showing an incorrect score.
I don't think players are able to queue for my groups, either. I'm not completely sure about this. My group sat silent for many, many minutes and usually, as we all know, Flex groups get requests almost instantly.
I'd also like to note that yesterday after I made this post I experienced another issue. When players would queue for my group, it would completely bypass oQueue's waitlist feature and I would instead get BattleTag friend requests sent straight into my request tab through the WoW interface.
I hope this info helps you fix some of these problems in the near future. Thanks for all you do.
Edit: one last thing, tried this with all other addons off and the issues persisted.