I've noticed that if I open the OS: Never scanned OS report from the main dashboard, in my case 115 machines, and choose to ping those assets the web interface becomes unresponsive. The status of the machines updates as the ping tests progresses, red/green etc... but if I click a machine to open it my browser just spins and never opens the asset page even if I right click and try to open it in a new IE windows or new tab. I also can't reload the main webpage again unless I close all of my IE browsers and open a new session. If I wait for the report to finish I can click around just fine.