This happens when Poser loads  the wrong geometry file for a figure. You might have two different OBJ base files with the same name, probably socks.obj. Poser will load the first one it finds and if it's the wrong one, you'll get this invisible figure problem a lot. This is why file naming and placement is such an important thing for merchants and freebie makers to pay attention to.

To fix it, you first have to find the correct OBJ file. Then Edit the CR2 to make sure it's pointing to the correct directory. Poser checks that directory first and then starts searching for the file elsewhere if it's not found where it's supposed to be. It will then grab the first correct filename it finds even if it's not the right file.