Straight from Castle Age
Important: Monster Lists
September 25, 2009 by Vulcan
Hi Everyone, during some performance upgrades, some players may have lost their dragon/monster lists. Your progress for each dragon is still saved, but you will have to manually go back to your friend's dragon and attack it one more time to add it to your monster lists.
Please save your friend's or your own user id, and add it to this URL to find their dragons: http://apps.facebook.com/castle_age/battle_monster.php?user=
your example: http://apps.facebook.com/castle_age/battle_monster.php?user=123456789
For those of you who have monsters to battle, you may have to re-publish a call-to-arms message for people to have access to your dragons.
We apologize for this inconvenience and have put in measures to protect against this happening again. Thank you for your understanding.