Hi,
Does it really go like this? Here are steps to re-produce
1. Create new fresh sitecollection
2. Install any app from app store (for example My FAQ List)
3. Confirm that app works
4. Change system masterpage, pick default oslo, check "Reset all subsites to inherit this system masterpage setting"
5. Access app gives something like this:
Accessing referenced file http://app-4dc50f03e4294c.appdomain.com/sites/wcm/_catalogs/masterpage/seattle.master from http://app-4dc50f03e4294c.appdomain.com/sites/wcm/My FAQ List/Pages/Default.aspx?SPHostUrl=http://spserver/sites/wcm&SPLanguage=fi-FI&SPClientTag=2&SPProductNumber=15.0.4420.1017&SPAppWebUrl=http://app-4dc50f03e4294c.appdomain.com/sites/wcm/My FAQ List is not allowed because the reference is outside of the App Web.
Is there any reasonable workaround for this? Thanks in advance
br,
-hk