Sean thanks for responding.
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Migrated map (and all dependencies) to a clean project. Map wouldn’t load at all stuck on 75% - force quit after 15mins. Tried again, left for 30mins this time, same result.
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Created a new map. Threw in a landscape and a few game assets. Saved instantly. No problem at all.
I am only using two movable lights in the game - one directional (sun) and one skylight. I tried switching to fully dynamic lighting anyway in case it was a lightmap issue? Set Force No Precompute Lighting and rebuilt lighting. Set No Static Lighting in project settings. Restarted. No difference.