Hi,
Under Internal Database right-click 'Sessions', select 'Properties'. Then choose 'All Sessions' in first two boxes.
Do you see any session now?
If you see sessions but don't see messages then maybe Reporting level is changed?
Under Internal Database rghit-click any session, select 'Properties'. Then under General tab look at the bottom. Switch the 'Reporting level' box to Normal, hit Apply and look under Messages tab.