I thought I'd test uploading a dead simple mesh as a control, but even though it worked, I got different results in...

I thought I'd test uploading a dead simple mesh as a control, but even though it worked, I got different results in different viewers! Even though it was uploaded in Firestorm, I couldn't see the mesh! It was of four posts and a wire fence, as seen in the Blender screenshot below. What I got was nothing in Firestorm, though CooVL viewer showed the posts and I was able to add a couple of prims for fencing. I though it might be a VolumeLOD setting issue, but the screenshot below shows that at 4.0!