Honestly, i have the same problem. It isn't a problem restricted Just to opera. It's also on google chrome, and i dont think this is related to your question but zoom and my whole entire pc has some frizzy text, icons and the whole screen. By any chance do you use an Acer Nitro 5 AN515-57, or give me your specs? I havent found a fix for this problem, so the best we can do is hope that we get a miracle!