Hi CiteNoir,
I was able to reproduce the warning message. What the warning is basically saying is that while you were in your mesh viewer you changed some of the “preview scene settings” in your 4.13 prjoct these changes cannot be converted with the project.
When it comes to warning messages we don’t typically log bug reports as this doesn’t inhibit your project in any way. This is a very minor issue and I wouldn’t be worried about it at all.
,
Ed