Try uninstalling GMail Provider and GMail, then reboot. Then reinstall in this order: GMail Provider then GMail. Try running GMail, it probably will hang, use a Task Killer app to kill it. Then reboot again. That is pretty much what I did and it has been working ever since. E-mails arrive within seconds of being sent, an audible notification can be heard and it shows the @ in the notification bar.
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