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I'm not sure if your problem is the same as mine but I've found a solution that works for me, maybe it will work for you and others as well?...
After trying what was suggested early on in the thread (Page 1), namely going to "Window > Lighting > Lightmaps" and disabling the "Continuous...
[ATTACH] Any idea what to do when the floor looks like this? The lighting also doesn't look as ambient as in the tutorial-video.