Did you do a clean install of tribes or did you just copy your tribes folder to it? If you copied your tribes folder, you need to go into console.cs (I think thats what it is) in your main tribes folder, and scroll to the bottom of the file, and change your video setting from "OpenGL" or "Glide" to "Software". Since it's a computer at work, I doubt it has a graphics card or the latest OpenGL software.
As for the not being able to ping servers, the only way you can get around that is to figure out how to open the required ports on the network at your work. I seriously don't think you should do that, though, because it could bring harm to your network. Insta-fired o_o
You will just have to write down the IP of the server you want to connect to, or if you plan on hosting a server from there, you will have to tell other people the IP for them to be able to connect. I wouldn't suggest hosting a server from work, either o_o