found the bug! since the update the matlib files of craft have had the mats renamed!
if it was "chrome_102" and you renamed it to "chrome" the the matlib file, outerra seems to have renamed it to "chrome_102" again! so it cant find the textures!
you should just be able to reinstall the craft again and it should work again! otherwise you will have to rename them in the matlib itself!
EDIT: never mind, not a bug! i had re imported the other day and forgot! thought it had happened to your file too but was wrong! not sure whats up with your file? try to re export it and re import it into outerra and see if its still giving you trouble? or if that fixes it?