System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67
Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-11 13:50, hash: rB06312c6d2db8
Worked: (optional)
Short description of error
Cycles Viewport is stuck on initializing
Exact steps for others to reproduce the error
dragging mouse back and forth on the Veiwport shading icons will make Cycles Viewport stuck in the initializing and Viewport won't work for that save file Anymore.
sorry for my bad English
