VERIFIED SOLUTION i
Products affected: MapInfo Pro.
When opening Bing Aerial (for example) in a Layout Window and changing the DPI to 250 and the Height to 50 ( File>Save Window As) the resulting JPEG images does not come out as expected as it contains a lot of white space.
This is a bug within MapInfo Pro.
ResolutionUPDATED: August 5, 2019
This was fixed in the MapInfo Pro 15.2.2 update patch.