**System Information**
System: Windows 7 64bit
RAM: 4096 MB
renderer: 'GeForce GTX 760/PCIe/SSE2'
vendor: 'NVIDIA Corporation'
version: '4.5.0 NVIDIA 364.72'
**Blender Version**
Broken: blender-2.80.0-git.0f5b53ba4dc-windows64
**Short description of error**
Cycles: Viewport playback flickers to black
**Exact steps for others to reproduce the error**
1. Open attached blend file
2. Set the large viewport to render (See arrow in screenshot #1)
3. Hit the play button
4. The area flickerst to black and back while playing the animation
5. The volume material is completly black and solid (Screenshot #2)
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