Apex Physx in maya 2016 not simulating

Anybody knows any reason why maya 2016 (64 bits) won’t simulate an phsyx cloth?
I installed the plugin, activated it and followed the instructions from a tutorial
The cloth has a material assigned to it and it skinned to a skeleton, I pressed the button to assign the cloth thing to the mesh… but when I hit play both from the time slider and the physx toolbar, nothing happens.