I'm not completely sure about this, though, and this may be wrong (may be remembering this wrong when I was troubleshooting) - I honestly just don't have the patience nor time to keep testing things like this, as I'm really busy with school and extracurriculars at the moment. I've done a lot of troubleshooting on the issue, and one thing that I noticed is that (I think) the IP of my system in the FBI app goes away (turns into an error code) whenever I load up these games and enter the overworld.
I'll say it now even though I mention it later, apparently this is a common problem with Sun/Moon, whether on Mac or PC. If I start recording from a new save file on Sun/Moon or X/Y, the recording turns to white at a certain point of the intro sequence (Sun/Moon) or goes black once the intro sequence ends and the overworld is entered (X/Y). I have everything set up and working correctly (to my knowledge, anyway I used the Mac version of these directions: ), and can get both games to be captured on my computer however, when I get past the title screen menu using a past save file on Sun/Moon, and into the actual overworld inside a Pokemon center or something, the screen on Mac completely freezes. I am using NTR 3.4 on my New 3DS XL and Nitro Stream/NTR Dual on my Mac to capture Pokemon games such as Sun/Moon and X/Y wirelessly. I'll start this off by asking not to be judged for using a Mac, but in my defense, it doesn't seem to be the issue nor matter.