[Starry Night Pro Plus 5 only]
Please download the Mars.zip file to retrieve a new Mars image that corrects this issue. The download is about 64 MB in size.
Unzip the contents of this file, and place the resulting Mars folder in the Sky Data/Planet Images folder - overwritting the existing Mars folder that is currently there.
Windows: Program Files/Starry Night Pro Plus/Sky Data/Planet Images
Macintosh: Ctrl-click on the Starry Night Pro Plus application and select Show Package Contents. Navigate to Contents/Resources/Sky Data/Planet Images