It ended up working after a few days - I tried uninstalling a few times to no effect but it seemed to have fixed itself.

Until it works, you'll have to download the file from the game page on the GMR website. You can also find the chatroom on GMR (look for the last entry under games that haven't started yet) and you can post your question there - the GMR mods are quick to answer there.

My GMR client is not syncing up the games I am involved in. My Auth code is fine as it displays my user and the rank points accurately, but none of my active games are properly synced into the client. I have tried re-entering the auth code and reinstalling, neither of which have worked.

Anybody have any ideas?