Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.17
Broken: version: 2.80 (sub 51), branch: master, commit date: 2019-03-21 00:58, hash: rB0bbff8a71138
Short description of error
driver put on influence of VertexWeightMix Modifer, and depended on other modifier's parameter updates only on preview but not during animation render
here is the blend file
and rendered animation to compare
In the rendered animation driver value clearly isn't updated by time.
rendering single frame works fine, as you have to go to that frame first which updates the driver.
Exact steps for others to reproduce the error
- Open blend file,
- preview viewport animation
- Render animation (took me 2 seconds)
- Compare the result