Using IE 11 , when I create a new rule profile based on an existing one, and the operation fails due to an error - I do not see the error window - whereas I do on Chrome:
Chrome - this "popup" is displayed on top of the greyed background, as I would expect. "Do not use this profile importer." is the error message produced by my own profile importer.
E11 - I only see the greyed background, no "popup" shows up