Trying to run a simple Sharepoint 2013 App in Visual Studio (however, the same thing happens with all Sharepoint-store installed apps). I have set a url
http://sharepointsrv/sites/devtest/ as the site to be used for debugging, (where devtest is a Developer Site) and to be SharePoint-hosted. Also in central administration, I have set
apps.sharepoint.demo.local as App domain and
app as App prefix in Configure App URLs page.
When pressing debug, my app opens in the browser but seems (see pic) like several images and styles are missing. Also the app url is quite big and strange: