Save files not being playable

[Skyy]

If you are having trouble with your saved files not being playable, close the game, properties > installed files, verify integrity and you should be fine

[Hairy Phil]

That doesn't affect save files, because those files don't come with the installation. You just coincidentally fixed some other problem that you were having.

[Skyy]

it worked for me so it might work for other people :-) just trying to be helpful