Hi, I will send this in to your support email but thought I would post here as well for others.
I am finding the latest versions of PS (1.01, 1.02) are not importing an OBJ exported from Mudbox correctly. It does not show any errors and displays the number of faces & vertices at the bottom of the window, but there is no geometry displayed at all.
If I use the 1.0 1760 build, it imports fine, though. I have also verified that other apps like Maya and Meshlab do not have issues importing the OBJ file correctly, either.
Cheers, Chad