Late reply... X-Plane is installed in a folder named Program Files on my D drive, not the C drive. Removing the libradio.plugin folder allowed the plane to load, but the flaps issue in this post remains and now the mixture doesn't work with the Honeycomb Bravo Alpha. It seems to be related to the flaps issue, as it "flutters" (for lack of better wording) the same way the flaps do. I fix was featured in that same post over a year ago, it must be a real pain to deploy updates...