Please try these steps to see the issue I mean:
Disable “View Source by EmEditor on Internet Explorer” option in EmEditor and exit.
Delete this key (or change the value in it):
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\View Source Editor\Editor Name\
Delete “AppVer” (or change it smaller) in:
HKEY_CURRENT_USER\Software\EmSoft\EmEditor v3\Common\
▲ to simulate the first launch after update.
Run EmEditor.
** See the change in:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\View Source Editor\Editor Name\