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Validation of viewstate MAC failed
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I've just downloaded and installed the trial of NetAdvantage for ASP.NET and I am presented with the following message on page load: 

“ Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. "

Is there a solution to this problem? I have seen this question asked before (unanswered) in the WebGrid forum somewhere, but I figured it was a configuration problem (since I am experiencing it with another control). Obviously, at this stage, not being able to get the control (WebHtmlEditor in this case) working, we are going to have to cut our losses and find something else.

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