By and large the tasks complete without incident. However, Windows had been bugging me for weeks to reboot for auto update, so I suspended all BOINC tasks, and went to let it exit all nicely. Upon rebooting, progress was lost, GPUgrid began the task from the beginning, then errored out.

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The ATMbeta tasks cannot be stopped under any circumstance or they will error out every time.

This is a known fact for this project. Accept that or move on.