I mentioned this a while back and I'm going to raise this issue once again because it's getting worse. FMP 14, El Capitan, and Kiosk mode do not play nice together. Going into kiosk mode results in blank areas of the top and/or bottom of the screen. This is particularly noticeable with a black background, but it's annoying no matter what. It's gotten progressively worse with later versions of OS X and FMP but it really needs to be fixed. I've determined that the negative effects can somewhat mitigated by turning on the Automatically Hide/Show Menu bar setting in OS X, but Kiosk mode promises fullscreen and even with that, it's decidedly not fullscreen.
Is anyone at filemakerincorporated tracking this issue? Any chance that this will be fixed EVER?