Looking at just the aspx file I can’t say for certain what your problem might be. The first possibility that I’d look at is that the update panels inside the repeater aren’t been rendered by the page on the postback because the triggers you have in place aren’t mapping because they’re inside the repeater.

I’d try using the ScriptManager.RegisterAsyncPostbackControl on the controls you currently have set as triggers as part of the ItemCreated event on the outer repeater. Then in the event handler for those controls that fire when they’re triggered on the server, call the Update method on the inner UpdatePanel to cause it to render itself. Let me know if that helps or not.