My answers below:

1. Open the Model https://my.vertabelo.com/model/kVeVbnHmra7sqYjzaJaTtWuaUySROIj6 and add a table and wait for 3 minutes for the error to pop

2. MacOS Catalina

3. 

4. I am not sure if I am behind the corporate firewall.  

Do you have any update on this issue?  It is causing delays to our project.  This is high priority.

-Sonny