I use Zoom client for Linux, version 5.5.4 (7938.0228) on a Ubuntu 20.04 distribution.

Since yesterday the screen sharing doesn't allow me to share a single window anymore: the only options are sharing the whole screen or sharing the whiteboard, and in the advanced options: sharing a part of the screen. I used to share a single window (my presentation) and I found this very comfortable. Any help will be appreciated, I haven't found any similar post on the forum. Thanks in advance. 

I'm getting lag every 2-3 minutes for about 15-20 seconds.

I'm on a Desktop PC which is powerful.

I'm not on Wifi, I'm directly attached to the network.

Speedtests are all super fast (gigabit ethernet, fast upload and download, latency is low teens)

I use the desktop app not through the browser.

All other services seem fast - Teams, Gotomeeting, VoIP phone, Discord all work no problems.

I'd like to try some more advanced troubleshooting (I own an IT Services business)

Are there any servers I could tracert to and test the connection over several minutes for packet loss along the route?

私は大学講師をしております。

ブレイクアウトルームを使用し、１５０名程度の講座で、一組３名、計５０組に振り分け「すべてのルームを開く」ボタンを押すのですが、そのボタンを押した以降、ブレイクアウトルームが作動しなくいことが２回続いています。
ブレイクアウトルームの設定は何度も確認しておりますが、特に問題が見当たりません。
生徒同士が交流でき、意見交換できるグループワークを中心とした講座展開を大切にしているため、大変困っており、原因などがわかる方がいましたら、ぜひ教えていただきたく思います。

Recently Zoom started flickering, more often when used in fullscreen and when someone is sharing their screen. 

I'm using linux PopOs and the flatpak version of Zoom. I've also tried the .dev version and had the same problem.

Grad if someone could help me.

As many have reported it's not possible to share applications or screen with zoom version 5.9.6 and later until 5.10.7.

I and probably many others would like to use Wayland as it is default in Gnome.

The last working version that I found to be working is 5.9.3.1911 version (https://zoom.us/client/5.9.3.1911/zoom_x86_64.rpm). 

Does anyone have 5.9.4 or 5.9.5 Fedora version or least knows last 4 numbers of the version so we could download and test?

or the workaround to use X11

https://docs.fedoraproject.org/en-US/quick-docs/configuring-xorg-as-default-gnome-session/

Another option to disable security and be able to share screen within Wayland is to:

ALT+F2

lg

#and enter in the console

global.context.unsafe_mode=true

This will give an option to share screen, but many times it will be shared just the background

Presumably it will be working from the versions of 5.11 on

Any additional feedback?