I've encountered a funky little bug with my Storyline 3 exports and it only happens in Chrome.
I have a layer that has buttons that allow learners to navigate between other layers (it's basically a prev/next set-up). However, if Chrome is at a zoom of 90% or below, some of these buttons fade out as the slide layer appears.
The player is set to 'Scale to Fill Browser Window'. I've set it to 'Lock player at optimal size' and that seems to have solved the issue.
Just thought I'd share! :D