Validation of viewstate MAC failed in Safari?

We had a similar problem with viewstate starting with Safari v 5.1.4.

While I have seen errors in my log that make me believe I'm facing the same issue as you, I have not yet been able to reproduce the error in a sample application. My guess is that the viewstate information from the timed-out page is being submitted to the login page, which is invalid. To correct this, it may be possible to put something early in the login page life cycle (maybe Page_Init) that would recognize when a redirect to the login page is happening (perhaps through the referer) and circumvent the viewstate validation.

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