@Danface I followed up with our engineering team there is a maximum of 32 lights that will cast shadows, and 48 total lights. Once you've gone beyond 32 shadow casting lights, shadows will stop casting for some lights. And once beyond 48, some lights will stop rendering.
Fixes posted for 27 and 32: 27. User Title is showing old rank titles in some users' Profiles, which looks like a duplicate rank. (fixed 8/10) 32. Missing icon for Sketchfab embed button at far right end of editing toolbar. (fixed 8/10)