Success! Looks like we've fixed this one. According to our records the fix was applied for
Ext JS Premium Member
Jamie, sent you a private message, Thank You!
Sencha - Sencha Touch Dev Team
I've made a simple testcase with fake remote data and tested it up against our latest code and it works fine. I tried taking a look at your application but it was little too complex to spend time on.
If your version still does not work after the next release, reply to this thread and I will take a deeper look into the issue.