I have made a test model to start modeling but I can't to get it work. I have uploaded the .obj file, which isn't too long because it's just a cube, to get some help. I exported it from Sketchup but it hasn't got rare tags.
What I get from console:
Unexpected data encountered while opeing file data/Flesk/modelos/Prueba-Cogs-2.o
Error loading .obj file data/Flesk/modelos/Prueba-Cogs-2.obj