AMD Green Planets
Newer AMD graphics cards that have GCN 1.2 have a driver bug that breaks the landing circle and visualization for area commands.
This causes the entire planet to change colour.
More information is available at https://forums.uberent.com/threads/workaround-stuck-green-all-over-the-planet-on-amd-cards.69731.
There is a fix mod called "Fix for green planet bug" by dom314 available in the Community Mods in-game mod manager.