For any of you running your ATI cards on Collatz, you may have noticed no work reporting/downloading. From their website:

Just tried it and it's back up and running with the client reboot. [H]ard Commandos, go check your clients - FreeDC shows our entire team with goose eggs for the past three days!That means that the IP address has changed so you will need to restart your BOINC client in order to upload your results and get more work.