Audio Settings dialog is blank on newest zoom version
zoom version: https://d11yldzmag5yn.cloudfront.net/prod/3.5.336627.1216/zoom_amd64.deb (downloaded 2019-01-03)
docker version: Docker version 19.03.5, build 633a0ea838
OS version: Debian GNU/Linux 9 (stretch)
See attached screenshot. Audio settings page is blank, which makes it hard to set volumes (especially since the linux client is notorious for defaulting to random values when you open zoom).
I was testing this inside of a VM, so it might have something to do with that. I'll test it on my host machine soon and post the results. Host: Ubuntu 19.10, Virtualbox: 6.1.0, Guest OS: Debian Stretch (9)

Well I don't know why.
We can try to update the base image from debian:jessie to debian:buster (or debian:stretch).
Base image is now debian:buster. It can resolve the issue.
Let me know.