Nevermind, I figured it out! In the sub-loggers I was using NDC all over the place, but not in the root logger (ClassC). On a wild-stab-in-the-dark-I've-been-working-on-this-for-8-hours-and-am-out-of-ideas-hunch I removed all the NDC's and it started working again.
I could have very well been using NDC's incorrectly in Beta8, but it did work, so I'd consider this a breaking change. Maybe it should go under consideration to have the release notes for Beta9 updated to reflect that so no one else wastes hours with the same problem. :-) Thanks, -Sam
