@batman4473 if anyone else has this problem in the future and see's this post i figured out how to fix it you need to go to settings type in hardware then turn off "Use hardware acceleration when available" and it fixes the problem.

Like the title says im getting red boxes everywhere when i watch youtube or any type of video. but it doesnt happen hen i use other browsers. when i hover over the play button red boxes will flash on the screen or while the video is playing. sometimes the video wont play at all and it will be one big colored box. or just black. but no other browser does it. Please help i love Opera GX and i dont wanna stop using it.