That was big help! It now shows the icons correctly and finds some files. The only thing that seems to be a problem is that I can't see the control panel when using MediaBox, and MediaBox doesn't let one browse photos by folder. It shows photos in multiple folders flattened in a linear list. Also, I don't see how to view photos at full screen and go to the next photo. In any case, this fix of the configuration seemed do the trick.
Thanks!