It’s the Advanced Sessions Plugin, at least the one I care the most about getting fixed. There were a few others, but using the individually or all at once doesn’t seem to matter it returns the same exact error with the same exact Paper2D files.
“MaskedUnlitSpriteMaterial” isn’t my material, upon looking through Paper2D since it came up a lot however I found it in the Paper2D plugin folder. Interestingly enough, no matter what plugin I happened to be using, it was always those same Paper2D materials that weren’t able to load, even though my project isn’t even using Paper2D (it would even get the Paper2D errors just launching the engine without a project specified).
From the actual editor, these are the error messages it was giving me:
Now I’m not 100% certain if what I did actually fixed this problem or simply stopped it from surfacing. After a sleepless night of trial and error trying to get it working, I may have stumbled across the answer. The plugin’s instructions say to place it in the project’s plugins folder, but if I place it in the engine’s plugins folder before compiling the engine it seems to work.
I may be wrong, but it just seems like a case of a very, very misleading error message. As you can see yourself, it’s referencing files that have nothing to do with the plugin whatsoever which lead me to believe it may have been an issue with the Github distribution itself, maybe not downloading some files or something. If you think there may still be a problem underneath all this, I’ll be more than happy to help in trying to hunt it down, but at least at first glance it looks like all it needs is a better error saying what went wrong.