Oshi, I had this problem as well, but this is what you do (credit to Recorthe):
Check back to your map in the radiant, look for colored text (or colored texts in a pile); if they are there this is what you do: select your whole map, including alien/human structures and lights and other entities; copy, make a new map (file; new), and paste and save the map as something else or another version. If the text/s is/are not there, I don't know the problem.