In updateGLResources() function - defined in ofxAssimpModelLoader.cpp - there is a ' if( hasAnimations() )' condition before calling updateVertexData on the mesh's vbo. I think you don't pass through this because you have no animation in your imported FBX. With RiggedModel inheritance you're updating your vertices but updateGLResources() seems to be defined for animation only. comment that condition and it should works.
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