After starting the new client the UI pops up just fine, but I am not able to connect to any globalchat or any TeamSpeak server.
Once this behavior starts, most of the time I am able to recover by removing the appdata folder sometimes though, the clients behaves just fine, or catches itself after restarting multiple times.
Attached is the log file my client produced. The error messages keep coming, I trimmed the log file as no new info is logged.
-- edit 17.12.19
After some further testing I noticed that when the client is closed for a while the startup process works as expected. This is really strange and rather annoying as I want to use the new client but sometimes I am not able to.