Artist had problem open his level after LayerInfo file was deleted
Create landscape actor
Create landscape material (Mat1) with Layer1 and Layer2
Assign material to landscape and create 2 LayerInfo files, paint on landscape
Save as Level1
Duplicate landscape material (Mat2), apply to existing landscape
Save as Level 2
Open Mat1, Delete Layer 2
Delete in asset browser LayerInfo Layer2 file for Layer 2
Save all changes.
Try to open Level2 map.
Here sample from crash log [2016.09.08-18.48.06:318]LogLinker:Warning: Can't find file for asset '/Game/EpicInternal/Anton/ArtTests_DesertTheme_sharedassets/OrangeSand_LayerInfo' while loading NULL.
[2016.09.08-18.48.06:319]LogLinker:Warning: Can't find file '/Game/EpicInternal/Anton/ArtTests_DesertTheme_sharedassets/OrangeSand_LayerInfo'
As soon I create new LayerInfo file with same name ( Material layer can have any name) I was able to open level
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-35766 in the post.