I switched from C2DM to GCM, and I thought I had this problem too. In short, try to remove the application from the phone / emulator, and then do not reinstall it on this phone / emulator and do not leave the phone / emulator working for several hours , then you should get a NotRegistered error if you try to click on this device registration ID.
If I remember correctly, even if you reinstall the application in C2DM after uninstallation, you will receive a NotRegistered error for the first registration ID, this does not apply to GCM (usually, if two registration IDs are not always the same), and I spent a week thinking GCM had an error when it did not send this error ...
Mohamed Hafez
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