Hi,
I consider that you could try to check the following path:
C:\Program Files\Windows Small Business Server\Logs\Console.log
And related events in event viewer. Based on my knowledge, Windows SBS Manager relies on a SQL database running on a SQL express instance called SBSMonitoring. Under certain circumstances, the database may become unusable, when this happens you can experience behaviors like the SBS console crashing, or incorrectly reporting the status of machines.
You may try to create a new, blank, database to regain functionality. Detailed steps you may reference link below:
http://blogs.technet.com/b/sbs/archive/2011/08/22/how-to-recreate-the-sbsmonitoring-database.aspx
Hope this helps and please help to accept as Answer if the response is useful.
Best Regards,
Carl