Just downloaded the Diablo and the Hellfire set. It keeps crashing on me. The only time it will crash is when it is in a loading screen (between two levels or taking a town portal).

It was doing this in both the Hellfire, and Dialbo. And after it crashes, it comes up with an error message "cannot save file" and it will just delete the character.

Anyone else having this issue? I have tried to run the "fix" through the launcher and redownload and reinstall but it keeps doing it.

Did you look here https://www.gog.com/forum/diablo if anyone else already solved it?