I use full-screen mode every day on my system (11" Air, early 2015, with Intel HD Graphics 6000 1536 MB, not presently hooked up to a monitor).
Yesterday I upgraded from Mac OS 10.12.3 to 10.12.4.
Now, I get occasional bursts of “static” (many small horizontal lines blinking in briefly, and possibly moving or blinking) while typing in full-screen mode. (Scrivener 18.104.22.168) They don’t seem to occur in normal windowed mode, but I use that less often, so maybe I just haven’t noticed yet.
I presume the OS upgrade caused this; not sure if it’s a new bug in the OS, or a change in behavior that’s exposing a bug in Scrivener.