I never tried turbo mode,it was always off and i experienced the problem, i turned it on to see, same condition still happens I downloaded Chrome and it is perfect.
I really prefer Opera but until some fix comes up i will have to use chrome, the flashing is very annoying, sometimes it looks like the computer is crashing.
Graphics go black momentarily but page never actually freezes

Forgot to add operating system Windows 8.1 64 bit

I assume these posts are current
I am having the same problem too, i get screen flashes i thought it was a maybe a graphic card thing, but i was watching a video on a webpage and it flashed ( the page )and the video shut off, its like the page reset
I get it all the time ,portions flash black
I am trying firefox and it does not happen on that so it is def Opera
I have used Opera for years and never had a problem until now.
Is there a 64 bit opera,? i have a 64 bit operating system,
I have completely removed and reload Opera twice , still same.