Why am I banned from GPGnet?

This is an aaaaaaaage old question, and probably causes problems for far too many people.
Okay, what you need to do, is patch your GPGnet, from whatever version you are to the latest version. This is probably easiest done if you just uninstall whatever version of GPGnet you currently have, and installing it from the following link;
http://thevault.gaspowered.com/gpgnetdownload/GPGnetSetup.1.5.225.zip.
Once you've done this, you may still find that you're banned. All you need to do (once SC and/or FA are installed) is click bottom left, on the icons for the separate games. Once that's done, you'll be unbanned from GPGnet and able to join chat.