I have noticed an error with the auto-fill feature on macOS High Sierra and FMA 15.0.4 (and previous versions). Basically, the program freezes for several seconds before completing the auto-fill. IN general, all drop-down menus also seem to be less responsive. Though not a critical error affecting data, it is a rather large usability hit for our larger user base. I noticed this issue was addressed in a recent FMA 16 update, but version 15 has yet to receive such an update.
I am hoping that this issue would be revisited and a future update to version 15 will fix this issue which has already been addressed in version 16.