Material saving issue during "Seperate by Material" During my workflow I am joining meshes together and then using "Separate by Material" and vice-versa. During this process, sometimes the materials are not saved. I posted about it in this thread:
Material names missing

I now uploaded a Blender file to Blend-Exchange to show the issue.

Here are the steps to reproduce what is happening:


Open the Blender file
Notice Mesh1 and Mesh2 have material slots and materials
Join Mesh1 with Mesh2
Go into edit mode, and select everything in the joined mesh and do
"Separate by Material"
Save the blender file
Re-open the Blender file and notice the material slots are there,
but the Materials are now "missing", as shown in the linked question


So why might this be happening?
This was a known bug in 2.77a.
https://developer.blender.org/T49228

I now installed Blender 2.78a and the issue is resolved by using the new version of Blender. The material is now saved and loaded correctly.