Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86
Broken: version: 2.81 (sub 2), branch: master, commit date: 2019-08-20 07:45, hash: rBf2cab8267f22
Worked: (optional) 2.80 official release
Short description of error
The 2D line display (i.e. CAD curves that have been converted to meshes) is broken in 2.81. See the attached image. The left window shows what the object looks like in 2.80. The right shows what the same object looks like when loaded into 2.81.
Exact steps for others to reproduce the error
I can't provide the CAD file but in my case, I have an object in 2.8 that was imported from a DXF object. It looks fine in 2.8. I save the object and load it into 2.81 and the image attached is what I see.