Hi John,
Your camera settings in Vue should be set to 90 degrees for field of view and a square format like you already have. Since the environment doesn't respond to lights the edges and corners are invisible if the map is seamless.
The maps we created were done with the ATI cube map utility.
http://ati.amd.com/developer/cubemapgen/index.html
This application lets you import, assemble, and preview environment maps. I'm fairly certain that Vue (at least Infinite) allows you to export cube cross environment maps which would be the best way to go if you use the ATI utility.
Thanks,
Dave
