Yup! I created a new empty C++ project and imported another compiled spine asset from one of the demos and it does the same thing. That leads me to believe I might have missed a step or somehow installed spine incorrectly. It compiles just fine though, so that's sort of odd. π I'm using the 4.18.3 Unreal engine. I'll send that to you asap. Thanks!
I think I know what I did.... I pulled from git-master, and not from an archived version release. I stripped out the plugin from the master branch and rebuilt everything with the 3.6 runtime and it worked! I must have missed that I pulled from the wrong source. :S