Change in my score for no reason

[Anonymous]

I received a credit alert today saying my score had dropped by 13.  When I clicked on the account that was changed as given as the reason for the drop, it was an old 2001 account that was clean, no lates, paid in full and no changes reflected at all.  What gives???

[cobaltnv]

Did you use that 2001 card recently after a long period of the card sitting idle?