It seems that Jack didn't get the stats corrections generated for Hydrogen@home.
Jack has delegated the corrections to zpm to do them one-by-one on request.
http://www.hydrogenathome.org/forum_thread.php?id=430
As a result I have generated the stats differential by member number for all 2351 project members.
I have PM'd this to zpm so they can get moving on the corrections.
Hopefully this will enable them to bring the stats back up to 27-Nov-2009, the day before their database was restored to the July-2009 image.
727 members lost credit so I expect that this will take zpm some time.
The data I sent to zpm should also contain the contributions of participants whose membership was lost due to their database roll-back.
Those members may need to re-join and then reclaim their points as their member ID's may now be different.
Please be patient whilst zpm performs the corrections.