We have two known issues on mac that are ongoing.
1) On some Apple machines (mostly 5k iMacs, but an occasional macbook), there's an issue with the video card driver that causes problems with rendering in LayOut.
2) SketchUp has never officially support case sensitive OS partitions, but SketchUp 2017 has worse behavior than before. (Most OS X installations are not case sensitive, so this is a rare one).
What machine do you have?