Mi ha risposto GOG e mi hanno risolto il problema senza Rivatuner (SONO DEI GRANDI QUELLI DEL SUPPORTO GOG!!!). Ecco la soluzione:
Hello,
My apologies for late reply.
Could you explain problem in more detail? Ideally by providing us video presenting issue?
Additionally, game seems to be in sync with refresh rate of your monitor. Please set a more standard refresh rate (60 Hz). To do this right-click an empty space on your desktop, select Display settings > Display tab > Advanced Display Settings > Display adapter properties for Display > change the Screen refresh rate to 60 Hertz.
After that please check if the issue persists.
Best regards,
0rcan
GOG Customer Support