Hello Paul,
It seems that your room is deleted as users have an error when trying to access it. Are you using trex? If yes, check if the index for room is OK. From tags I guess that your are with EP7.0, have a look into advanced property under System Administration -> System Configuration -> Collaboration -> Room Search Properties. You will get the name of the index and then go to index administration to check if the index is running.
Olivier
Message was edited by: Olivier SEGOL I was thinking of a similar isseu than : http://scn.sap.com/thread/1847314