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Did you make sure it was the right size?
The file size may be too large, that could be the problem.
What has happened to me a few times is that I've changed my picture and it's gone through, but for some reason it still shows my old picture for a while. I just logged out and back in and I think that fixed it.
Try Ctrl + F5 on your browser. Or like what cpark said log out and log in again.