I had no issues at all with this version, works great, also tested 4.3.1 beta arm64 on ubuntu 20.04 with mate desktop, worked without any issues.
However, there is one issue which some users might get crazy about
OS used: Debian (Linux hystou 5.10.0-1-amd64 #1 SMP Debian 5.10.4-1 (2020-12-31) x86_64 GNU/Linux)
TorGuard Client options used: start on boot, autoconnect on start, kill switch
How to reproduce
1. Enable torguard client to autoconnect on boot/startup with kill switch (I did not test with disabled kill switch)
2. Disconnect your video (hdmi/dp/...)