**System Information**
Operating system: Linux-4.19.0-5-amd64-x86_64-with-debian-10.0 64 Bits
Graphics card: GeForce GTX 950/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.74
**Blender Version**
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-24 18:46, hash: `rBc0c1b4542f39`
Worked: (optional)
**Short description of error**
Compositor animated nodes won't update in the viewer
**Exact steps for others to reproduce the error**
> connect a brightness node between source and viewer/composite
> Add a keyframe at 1st frame in bright param.
> go to 25 number frame.
? Drag the bright param to increase.
> Viewer is not updating.