A problem can occur if you import an IXP file that includes incorrect permission settings. If the IXP file includes adjustments to the entity type permissions (specifically Category and Page) then the Inspect and Edit tools fail as they attempt to directed the editor through a secured page.
The temporary work around is to check the entity type permission and remove the SSL setting for any and all entity types. It would be extremely rare to ever need an SSL permission on an entity type, but the permission can automatically be changed when importing an ixp file that was created on a system that includes the incorrect permission settings.