lastseen dates before Thu 8 Mar 14:17:18 GMT 2012 are not recorded.

[Anna Bakker]

Players who have not joined since Thu 8 Mar 14:17:18 GMT 2012 do not have recorded last seen dates.

To fix it, a script could be written to update these dates using logs.

Two players who do not have a recorded last seen date on the control panel: http://minecraftonline.com/cgi-bin/controlpanel?playerinfo=Alabasterd and http://minecraftonline.com/cgi-bin/controlpanel?playerinfo=wingnut321