Multi-touch appearing as one touch
<p>I am getting inconsistent results using multi-touch.
I am trying to detect a 2 fingered swipe. 
Sometimes I successfully detect 2 touches, othertimes it appears as 1 touch but oscillating in position between the two fingers.</p>

<p>I created a test app to try to isolate this behaviour but I found that the test app behaved ok.</p>

<p>The app where the problem occurs has a number of sub views, and my touch detection code is on the root view. Could this be the problem? Do I need to include touch detection on every subview?</p>
