Hello!

Actually with Cornerstone it's such old code it's actually using a <frameset> rather than an <iframe>...! Causes much the same problems with Safari though.

No, I know of no other workaround aside from using the launchNewWindow extension. You only need to configure it to activate for iOS though.

And yes, SCORM Cloud doesn't use either <frameset> or an <iframe> which is why it all works fine there.