Blank page when opening course content on mobile app

Hello,

I'm using Mooble Mobile APP 2.0 (on iOS 8.4) downloaded from App Store.

When I try to download a content (like a PDF, DOC, etc.) from my e-learning platform (http://patto.unite.it - I have the latest version of 2.9.1 installed) I have a blank page (see attached screenshot). In desktop version it works perfectly.

I have tried to use a different platform (like moodle demo) and the mobile app works fine. It seems clear that the issue is in my platform, but I don't understand what is the issue.

Anyone can help me?

Thank you, Paolo.

P.S. I have tried with Android APP too, but the result is the same!