Since upgrading to Visual Studio (Professional) 2017 I've got a problem with the page designer Design and Split views after changes have been made and the page saved. To get the view back properly I have to close the page and re-open it.
The page has an outer master page (show in green), an inner page (show in blue), one content panel (pink-ish) in the HTML <head> and another content panel (light-pink, only shown in the second image) in the BODY html.
After changing and saving the page only shows the outer master page content is shown, there's nothing shown for the inner master page, or the content placeholders.
