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https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Layers-in-Scene-Explorer-disappear-in-3ds-Max.html Issue:When working in 3ds Max, existing Layers disappear and pre-existing objects can't be added to a New Layer in the Scene Explorer (e.g. meshes, nodes, etc.). Only new objects can be added to a newly-created layer.Solution:Use the attached MAXScript on startup to resolve the issue:Ensure 3ds Max is closed.Download the attached MAXScript file: fixInvisibleLayers.msPlace the MAXScript file in the 3ds Max startup folder: C:\Program Files\Autodesk\3ds Max <version>\scripts\StartupRestart 3ds Max.Attachments:fixInvisibleLayers.ms; https://help.autodesk.com/sfdcarticles/attachments/fixInvisibleLayers.ms