Since the two new DLCs released today (3rd June 2015) Raptr has caused Witcher 3 to CTD. I have disabled the overlay but a pop up window still appears to tell me video recording is disabled and then I crash straight to desktop.
Only workaround that works is turning Raptr off.
Specs just in case:
24 Gig RAM
Sound Blaster Z
All drivers are latest.
Same here, but very recently. I thought it was caused by the last update on GOG Galaxy, but I noticed all is fine if I quit Raptr. Any solution ?