Facebook Connect SSO not working on some iPhones?

I think that your problem is that you don't have the proper configuration, either in the client side (your app) or in the server side (the FB app configuration). Please, check both things as follows.

I have seen this with the 3.0 SDK. The reason it occurs is because of the way facebook caches access tokens. Access tokens are cached both in your app, and in the facebook app on the device (at least conceptually).

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