Just upgraded to 7.6.3 on the way to 14
Two things seem to have happened. First, the banner links listed on the home page vanished. Second, the css files don't load.
If I try to open an external link to another page, I get the message
String "26874" is not a valid udi.
Runs on line 6 of NavPage.cshtml
var relatedMedia = CurrentPage.relatedMedia;
In dashboard, the link is exactly correct, but when I preview it, I get a 404 error.
This makes me think the links have actually been changed to new values, which don't match what is in the system.