I have a ticket open for this but I thought maybe others have/are encountering this issue. The RadEditor will not work in RenderMode=Mobile on iOS 10, at least not in a RadWindow. If I switch to class mode it works fine, but the toolbar looks horrible on the small screen.
What options/workarounds do I have? Can you have a different toolbar on mobile without changing everything? Why does this not work? The issue is you can open and edit the text but when you close it you can no longer scroll the RadWindow, which you cold scroll fine before editing the text in the editor.