When I put a copy of a user created (both my own and others') map in the "Galaxies" folder described in the instructions, and try to load it, something goes screwy. The map appears in the pregame menu, I set up a SP match, and it loads...but it doesn't load. When the "loading" bar is complete, a "mission failed" message pops up, and when I select "keep playing" there's nothing visible. Nothing. I zoom in and out, change my viewing angle, rotate around, and there's nothing but empty space. Please help.