I spent about two days trying to figure out why the mobile preview scene was so much darker than the default "Shader model 5"preview. It's purely because of the slightly too clever auto-exposure. In actuality my scene was dark and Unreal kept implementing its exposure compensation in the shader model 5 view, which would brighten up everything. So - it's not weird global illumination, or a stray light, or a weird emissive material - it's your view exposure. Turn off the game settings check box and set your value to 1.0. That will show your scene for what it really is - and your mobile preview *should* look closer to your desktop view (I'm actually finding it a tad brighter now haha)
I've encountered hangs at these two percentages now - looking at the task manager, it seems like shaders are being recompiled, I think if you're patient and wait a long time (like more than 15 mins, maybe 30 mins) it might actually eventually load.... However if you're not, like me - for the 39% case, I found online that the "solution" is to rename the "Config" folder within your game project to "Config_Old" or something else. That should get the editor loading up fully. However it does wipe all of your project settings, so I think you'll either have to copy those back in, or load a preset or just make sure you set them all again! Frustrating stuff!
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