Not sure if this is a bug or not but with a group we entered the crypts the other night. We got the key required to enter the door after the bridge which gives you access to the Vampire Keyholder room. Unfortunately the person with the key was killed and when the party fled they could not exit from the area without the key. Hence you can use your imagination to work out what happened after we got to the door and found we could not get out...
Is this deliberate? or should you require a key to enter but not to leave?