When editing the Encryption Management Server Message Templates using Internet Explorer, after clicking the button to Save, a popup message appears saying:
Are you sure you want to leave this page?
Additionally you have the following options:
This is due to the Compatibility View mode being enabled in Internet Explorer.
The web site might be in the Compatibility View list or listed in the Local intranet sites (by default the intranet sites are displayed in Compatibility View).
This issue is resolved by changing the Compatibility View setting in Internet Explorer.