You have made a fix on our request to the SILK template engine. THis was because Iframes where being loaded in its own window instead of in the page. The fix resolved this. However the fix was not complete beacause as we now discover the iframe flickers on iPhone 6S and possibly more mobile phones.
You can find the app inside an iframe here: https://www.hornbach.nl/cms/nl/nl/vestigingsinfo/over_onlineshop/project_budget/project_budget_aanvragen/project_budget_aanvragen.html
This is an issue on live environment of one of our clients so please attend to this urgently.
I hope for you (and me) that it can be fixed. because I fear it's pretty hard to fix due to the iframe
(see my own thread about iframes, safari and asp.net -> http://www.outsystems.com/forums/discussion/20392/cannot-decrypt-the-content-application-in-iframe-in-safari/#Post79609 )
Like João Rosado said, it's not silk-related afaik.
keep us updated though!