Having the exact same issue with auto and quick saves. The system is configured for up to four auto and quick saves. After the last update I've been getting error messages when auto or quick save initiates. A dialogue window takes me to the desktop and states file xyz cannot be modified.
I've changed the save points default to one, removed all the save points from the game, and the files are still there (four for each save type). I cannot manually delete the files/folders as they are read only.
