System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.86
Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-24 14:22, hash: rB507ffee6e1f4
Short description of error
mask popover (texture paint mode) is crumpled