When trying to edit a report on NPC or change a group you may see the error :
"You have closed the main windows. No action will be taken on the choices in this dialog box."
NPC on Internet Explorer
This due to Internet Explorer not running in Compatibility Mode.
Use Chrome or Firefox, which do not have this issue.
If you must use IE, enable Compatibility Mode for the NPC site by following the steps below:
1. Go to Settings->Compatibility View Settings.
2. Then add the server name or website for NPC and click “Add”
3. Refresh the page and attempt to change the group again.