Unable to send test emails

When attempting to send a test email, we click Send Test but then nothing happens. We should be seeing a pop-up like the one below:
Send Test Popup
While sending a test or final message previously, we checked the box in the pop up window that says "Prevent this page from creating additional dialogs." 
Send Final Popup

Our site is now preventing those boxes from showing, and thus stops us from sending out messages. 

This can be resolved by resetting our browser. The following guide shows how to reset Chrome, Firefox, and Internet Explorer. 
http://www.howtogeek.com/171924/how-to-reset-your-web-browser-to-its-default-settings/
 

Environment

 Chrome;Firefox;Internet Explorer

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