So, I started off my new year this morning updating my GPU drivers and rebooting this machine: http://www.primegrid.com/show_host_detail.php?hostid=372374. When BOINC came back on line, I noticed that I had ESP sieve WUs running beyond 100% completion, one even went as high as 3500% done, but the run times when they finished (progress resetting to 100%) were actually lower than the typical runtimes of normal units (18-20 minutes), but were still being validated against other computers.
3 of the 4 tasks:
http://www.primegrid.com/workunit.php?wuid=416868085 - (still pending at this moment, but this was the 3500% WU)
Is this a quirk? An error? A loophole for disreputable types? All the WUs that were later downloaded are running normally to 100% and completing in the expected time.
Eating more cheese on Thursdays.