I scrolled through quite a few post.
Perhaps Ionside can actually post in the FAQ known issues and work around/solutions.
Otherwise it is a guessing game on what words to search for and pouring through dozens of post.
Solution as previously posted:
SJM
Guest
If you want to play a saved game from a custom map, first start the original custom map then go to Menu and Load Game and load the saved game. This is wacky but it works...