What do you mean by no surfaces - there’s geometry showing, but nothing in the Surfaces pane, or is there simply nothing at all to be seen? Which version of DS is this (Help>About DAZ Studio) and what clothing?
There is nothing in the Surfaces window, and the model does not show up in the display, though you DO see the ‘limit’ borders/lines and the bones (if made visible), and the model is listed in the Scene window.
I suspect you are using a very old version of DS4.0 (as I said, you can get the exact version from Help>About DAZ Studio, in the top-left corner) as the groups in the OBJ file are set up in a way that caused problems for early versions of DS4. Updating to a newer version should fix the issue.