by the way its not only opening scene, those flashes everywhere and so bothering. even you walk, you can see those colorful lights at your foot. so annoying.
if you have ssd and game location is in hdd then it won't work. i had same trouble but i fixed it. transfer to ssd, select locate game in ubisoft connect, locate game in your ssd and play.
have same problem, gtx 960 gaming 4g.