Never had this problem with Wilbur before...

Doing a basin Fill on an .mdr file and the end result shows the land as being flat and map info says the elevation is in the millions of millions of meters range. Scrolling the mouse around on the land gives all sorts of different elevations. All of this is with nothing selected. Conversely, if I have an elevation range selected (say -300 to 10,000 meters) the basin Fill works just fine.

The .mdr file is a portion of an FTPro file in a miller cylindrical projection saved as Wilbur MDR Files (I stead of Special since I wanted to maintain the projection shapes) at 4097 by 3103 pixels.

Any thoughts on what might be happening?