[2020] Game freezes when refreshing lightmaps and starting test mode at the same time.

Hi Trackmaniadude, thanks for posting about this and welcome to the Trackmania forums.

How many times are you able to repeat this issue? Have you noticed any pattern of when this happens, such as is there are certain thing you are doing in the editor when this happens other then starting test mode? Are you able to screenshot when the screen goes dark or when the game crashes do you get any error message?

Also, when the game crashes, does the game quit to desktop or does the game stop letting you input any commands meaning you have to forcibly close the game?

Once you get answer the above we will do our best to look into this further for you, thanks.