Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GT 730/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 411.63
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
Short description of error
Masking in sculpting mode looks working but it is not visible even if those option is on.
Mask is appear only in Dyntopo mode.
Exact steps for others to reproduce the error
Select object and change for sculpting mode. Try mask brush or use shift+ctrl+LMB to select part of object.
Visually nothing happens. When you change for any other brush you can check so mask is there.
When you turn on dyntopo mode and after view port rotation, mask is appearing.