g1smd - 1:39 pm on Mar 14, 2012 (gmt 0)
The old style reports visible until a few days ago showed several errors for a site; errors that had been fixed many weeks ago but which apparently had not been recrawled to see the new status.
The new style reports show zero errors for this site (great!) but the historical graph drops to zero on Feb 22nd, several weeks earlier.
Why the discrepency?