When I get a new mail on my Gmail and it appears on then notification bar and I click on it, the Gmail app starts and show the following only:
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I waited for 9 hours, nothing changed.
For a test, I clicked on a random white area and the Reply function was activated!
So it seems, the mail was long open but the progressbar never disappears. If I press Back and open it inside the app, it shows the letter with no problem.
What could cause this?