I am trying to configure my Sharepoint 2013 farm to host apps. Specifically, I'm trying to get some Microsoft Access functionality. It's turned out to be quite a pain. I've manged to configure my SQL installation with the needed features, configure service applications via Powershell, and configure DNS and catalog URLs. I'm at the point now to where when I add an app to a site, I receive a preview of the app with the text "We're adding your app". It has been stuck on this screen for about 2 days now. I am a site administrator and have checked the app requests portion of Central Management. There are no pending requests. How do I figure out where to go from here?