When you run Control Panel on an MSMQ independent client, double-click the MS Message Queue icon, and view the Mobile property page, the Current Site and the list of new sites may be blank. This situation occurs when you view the Mobile property page immediately after installing the independent client because the MSMQ service doesn't create these entries in the registry until two minutes after the MSMQ service starts. The entries are then updated every 12 hours.
To work around this situation, select anther property page, wait 2 minutes, and then return to the Mobile tab.