Adaptive Subdivision Hides Parts of Mesh I'm using Adaptive Subdivison Surface on a model and some sections of the mesh just dissapear when I go in render mode. I'm using the material Displacement mode to "Both". Also, I'm using Simple Subdivision Surface Modifier. 

Not sure what is happening. Googling didn't return any useful results, either. 
Is the topology somehow affecting the hiding? 

Solid Mode:


Rendered mode:
It seems that the problem is related to the ngons the mesh has. Convert them to quads and try rendering again. Also, it seems that this only happens when the shading is flat.