My apologies if I'm on the wrong thread. Please let me know.
However, I'm testing the latest update to the iOS 9 beta on a 3rd gen WiFi only iPad (32 GB in black MC706LL/A) and am having an issue.
When I'm in an article and invoke the UI Nav Toggle function, the screen freezes, the nav does not come up, and I've found no way to get out of it except to close the app and reopen it.
I've confirmed this both with my own HTML article as well as the one provided by Adobe in the "Adobe DPS 2015 HTML Gesture API Examples" (and made sure I was using a fresh copy directly downloaded from the server - link from forum main page below.) iOS 8.4 works perfectly.