Having issues with Advanced Email Notification options

When clicking the advanced tab in email notification area under settings the whole browser goes blank. This is happening on all my forms. Need help asap. My company needs these forms working as soon as possible. 

Kindly be informed that one of my colleagues has already replied to your same inquiry via another support ticket. You may navigate to it by clicking here.

Please note that posting to more than one support ticket for same inquiry makes our response to them much slower.

Your understanding is most appreciated.