@omi-kun That didn't fix it for me, still there
It just started appearing yesterday idk why, I have the latest opera version

Just randomly appeared out of nowhere, if I disable bookmarks bar the border goes away and if I enable it, it comes back

Ok so setting that flag to either D3D11 or D3D9 and I get way less crashes

Still does stop responding sometimes but rarely now

Tried all options in that flag (with restarts), still get the not responding message
Geforce now just streams back a video on your screen, you're not playing a game using your own hardware

If I set that flag to OpenGL I get a black screen while using geforce now

Weirdly enough I can still here in-game sounds and music playing, but the browser tab itself gets unloaded from my memory

(the value where arrow is pointed at was around 200,000KB of usage before it got unloaded and then stopped responding)

After I installed the 078 core update, anytime I open Geforce now in opera, game loads but then opera stops responding and I have to close and re open the browser

Never happened before 078
Not too sure if this is because of opera itself or Geforce now
Help would be nice

been having the same problem, this is getting annoying and needs to be fixed