Stumbled across this. Happened very quickly and out of nowhere.
According to the populace of my colony, inside it's very hot and very cold. No way to tell though...
(http://i304.photobucket.com/albums/nn175/delane_waz_here/RW_zpshyhflojr.png) (http://s304.photobucket.com/user/delane_waz_here/media/RW_zpshyhflojr.png.html)
https://ludeon.com/forums/index.php?topic=10553.0
Someone else had the same problem.
I'm getting the same thing, no idea why and nothing I do fixes it. time to re-start the colony *sigh*
Seems like a bug; please post in existing thread if you have any more info.