Hi everyone, I've been having an issue with YouTube for a while, where the first time I put it in full screen it's fine, but then if I come out of full screen and back in, then I get a white border (a few cm wide) on the right and bottom edges of the screen. Toggling full screen a third time typically fixed it, so while it was an annoyance I didn't bother making a thread about it. However, something has now changed (in the past day or so). When I go into full screen now, Safari's scroll bar still appears at the right-hand side of the screen (and if I use it, I can see the comments etc). Toggling in and out of full screen has no effect; I'm no longer seeing the plain white borders, but the scroll bar is refusing to go away, and it's distracting when watching predominantly-dark videos. The same thing happens in the guest user account. I'm running Safari 12.0.2 on OS 10.13.6, with a GTX 960 if that matters. Has anyone else run into this? Any ideas on how to fix it?