So download the Dev version today and wanting to see the new items.
Went to calc the texture map and when it was done in the left corner was black box. This does not effect any of the outcome when exporting, so try redoing the calc to see if reproduce the same results. So tried it again and same black box appear, its got to be something simple but thought let you know Arron.
Here is a image
http://www.rage-of-fire.com/downloads/i ... ackbox.bmp