Last Beta change randomizes save game New World
Don't see "random" in this thread so will post here - loaded the save game from 1.3 that used the prior iteration of this beta, and it randomized the New World in the save game. The early clue to this was that loading the save game started a random world generation process.
I had random checked since I had tried a different start.
So I restarted the game, went to Single Player, unchecked Random NW, exited to Main Menu, returned to Single Player, loaded save, and random new world generation again commenced even though the save game selection had RNW unchecked.
Decided to opt out of beta for this updatesince version prior to 1.4.1.1 unavailable as an option.
Went back to 1.4.1.1 and the second save game was not corrupted even though viewed by selecting it.
Under 1.4.0 the savegame I had opened remained randomizing, though the next oldest was not randomized - so it looks like some kind of randomization corruption of the first save game.