I'm aware that there was another thread made with the same issue within the last couple of days, disabling my antivirus did not allow me to log in, nor did any suggestion from the FAQ help me.

My launcher updated to the newest version of fgunz and I was able to play fine for a day. When I came back the next day, it gave me the "Patching has failed" error.

I reinstalled fgunz and tried launching it, still no dice.