Occurrence

When I add a Bing image or other tile server layer to the map window, the projection is changed and I am unable to change the mapper's projection to the desired UTM or other projection.

Solution

Reprojection support for Bing and Base Map or Tile server layers was added in MapInfo Pro version 2021, which is in the Discover bundle version 2021 Update 1.

In previous versions:

MapInfo disables the support for reprojection on the fly of tile server image layers.
However as a workaround a static copy of the background imagery can be saved and then reprojected with Discover.

1. Open a map containing the Bing image and zoom to the area you wish to cover.

2. Select DISCOVER>Images>Map to Image. Save the window (Tip: you can set the Detail to 10x to improve resolution when zoomed in later).
Select Save as PNG format (recommended format).

3. Select DISCOVER>Images>Reproject Image. Select the map image that has just been created and reproject to the desired projection.

For a bit more information on the Bing Maps Tile System and the map projection therein, see http://msdn.microsoft.com/en-us/library/bb259689.aspx