Thanks, that DOES appear to have fixed it.
I guess starting a new game 'clears' whatever savegames were corrupted. It seems clear to me there was some issue with writing/reading the save games, even if it never gave me an error. The quickload wasn't working (even though the image was correct) and any other 'normal' save had only a blackscreen.
Glad I can continue on in Cyseal.
Could you load an old savegame after this? Or did you just start over the game?