On our development box, we upgraded one of our websites from DNN 7.4.1 to 9.1.1.129-232; with an upgrade of 8.0.4.226 in-between.
Now if I go into Settings -> Site Behavior -> More and then click on "Open HTML Editor Manger", I get a 404 error.
Any ideas why and how do I resolve this?
THanks..