This resets your Profile Manager back to it's DEFAULT CONFIGURATION. You will loose any setup configurations here...but it has worked for me in the past.
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OPEN TERMINAL (Wait a few moments after each. Results may take up to 20-30 seconds to finish some tasks)
cd /usr/share/devicemgr/backend
sudo serveradmin stop devicemgr
sudo serveradmin start postgres
sudo rake db:drop RAILS_ENV="production"; sudo rake db:create RAILS_ENV="production"; sudo rake db:migrate RAILS_ENV="production";
sudo serveradmin start devicemgr