oenophile02: I frequently have problems saving the game, especially when I use the quick-save (Q) feature. The save fails and then the game asks if I wish to exit. NO, of course not... I want the game saved!
So, I turn around and do it the slow way and then continue on.
I also had a lot of trouble with the same problem. Even though I was a complete amateur, I read ini files and lua files. The final solution was to change the Japanese katakana word "ドキュメント" in OneDrive to the English word "Documents." I made the change in OneDrive settings after logging into the Microsoft website instead of using Explorer. After that, I was able to properly recognize the save location in the game. This solution may be limited to problems in Japanese. What I can say is that it is worth checking whether the name of the document on Explorer and the document on OneDrive is the same.