System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71
Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: rB3e85bb34d0d7
Worked: (newest version of Blender that worked as expected)
Short description of error
i initially thought part of my mesh had glitched and became locked. I couldn't select or transform the vertices (could select edges and faces), but i discovered that after pressing alt-h "re-enabled" them, allowing me to resume normal operation.
Exact steps for others to reproduce the error
I don't know how exactly this happened. i think it may have occurred while switching between edit mode, sculpt mode and object mode.
the issue is visible on the ear vertices of the character in the attached blend file.
