Strange, for us the new update fixed some issues. It was too dark because some lights did not work in the published map like they did in uefn session. For example, the ceiling lights (props) did absolutely nothing but they started functioning correctly after the recent update. What if it was too dark and you adjusted brightness on the device/monitor and now it looks too bright?
UPDATE: light is broken again in my map. I suspect next time I play it might work or might fail.