Symptoms
Error preventing all Appit activity - New Master Page was installed
Diagnoses
Occurs when attempting to go into Applications on a new list.
Resolution
What occurred is that when the customer was applying master pages to their environment those pages were forced into the App Web which made it impossible for the customer to Appify any lists or libraries as well as access any previously Appified items. The customer was directed to the following fix for his onprem environment:
http://planet-sharepoint.blogspot.com/2013/10/master-page-inheritance-breaks-apps.html
The script supplied here fixes the inheritance issues with the App Web and allows the customer to be able to use Appit again.
