Edit: I’m glad so many of you have had no issues with multiple monitors. My set up is a little unusual (3rd display is an infrequently used large tv hooked through the receiver) and is definitely solveable but will take some effort (and honestly, I’d rather spend my spare time outside or with friends, so who knows when I’ll fix it.)
Likewise, I prefer to stress that my system worked great out of the box. I just couldn’t resist tinkering with the audio setup, because I can and wanted to. I broke something, fixed it again, all is well.