Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.51
Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-17 19:55, hash: rB4bce9c5283e5
Short description of error
After doing a bit of line cleanup, all of my Fill materials are rendering as black. A couple Line materials have retained their color, but any new materials, either line or fill, just appear black. The issue does not appear in the Solid viewport shading.
Exact steps for others to reproduce the error
Load the attached file.