I am attempting to upgrade my project, but I can’t get it past 4.13 without most materials on my meshes turning black (or transparent?). I have tried 4.14.3 and 4.15.2.
I am willing to provide a download link for the project to Epic Staff to debug if that helps!
Aha! That was it! The directional lights’ own mobility was set to static. That worked fine in 4.13 and earlier. Changing it to Movable fixes it in 4.14 and 4.15.