Hey!
Did you find a solution to this issue? I am having the same problem. I have tried many files, simple and complex, but nothing shows up. Layers are all there but when I select, there isn't anything there. When i tried on a friend's co,puter with the same version of TwinMotion and Rhino installed everything worked fine. I tried reinstalling Rhino, DirectLink, TwinMotion and even tried earlier versions of TwinMotion. I have a project due in a few days and this is the only thing holding me back.