I figured out the meshes were not showing up - I exported them from Houdini FX. I resave them in Blender and they show up. But for me no .obj directly from Houdini works.
Gaiascope: Really sorry to hear this. A preview of 1.5 has just been made available -- do you still experience the same issues with 1.5? http://quixel.se/suite/Quixel_SUITE_1.5.zip omgeric: Thanks for reporting! Feel free to upload the Houdini mesh and we'll have a look ASAP. - Teddy