So RestAdapter right not has to be used from the UI thread (an Activity or Fragment) otherwise the callback may not be called. More specifically, the callback provided to read, save, etc is only called on the UI thread of the application. This makes it really easy to put UI code in the callback, but the side effect is if the UI thread is blocked or not running then the callback won't get fired. I don't think this is a huge problem for 1.0 (assuming we document it), but I would like to get it fixed sooner rather than later. The easiest was to fix it would be to attach a handle to a Thread (via a Handler, Looper, or Thread) to PipeConfig that is passed to the RestAdapter. If one isn't provided we can keep the same behavior we have now otherwise we can use the provided thread. Make sense? Summers