In the gist above I create a swipe area using the YUI scrollview and the scrollview-paginator modules. If you visit the demo on an iPhone and swipe between the pages you will occasionally see that the page transition does not happen (making it appear that the swipe had no effect) even though the "indexChange" event was still fired. I have see this happen on iPhone, Android and Firefox.
In researching this I found that in scrollview-base.js
when _afterScrollChange calls scrollTo the 'x' parameter gest set to null even
though _afterScrollChange is passing a number to that method though, I have not been able to determine why this is happening.
Just realized I should have submitted this issue to yuilibrary.com which I have done here http://yuilibrary.com/projects/yui3/ticket/2533194