1. Save the URL at its current length and close Web Designer.
2. Open Object Browser and scroll to the table RelatedApplication:
3. Double-click on the Dependent application from the list, and update the "URL" to reflect the full path.
4. Save, and close Object Browser.
5. Next, open Web Designer and confirm that the full URL is displayed and used.
Please note that this is no longer an issue starting in version 8.1.2.