I am still struggling with rendering models in libgdx, so I did the following simple test:
Download of a model: http://www.blender-models.com/model-downloads/characters/id/survival-character/
Open the model in Blender and export via the Addon: https://github.com/Dancovich/libgdx_blender_g3d_exporter
Load and show the model like described in many samples
The result does look like in the right image below. What am I missing?