Just updated to 3.6.8. Now can't navigate reliably. Frequently get this error message: "Server Error in '/' Application. Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies th

Just updated to 3.6.8. Now can't navigate reliably. Frequently get this error message: "Server Error in '/' Application. 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." Pending fix of this glitch, is there a way to go back to previous version of Firefox that worked perfectly well?
== URL of affected sites ==
http://www.americanleather.com/ComfortSleeper/Madison.aspx?page=2

Hi JH,
According to your description, my understanding is that you got an error when you deleted  columns in SharePoint 2010.
Please add the following string in <system.web> section of your web.config file :
<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never" />
Note: before changing web.config, please make a backup for the file.
Here are some similar posts for you to take a look at:
http://forums.asp.net/p/1355367/2778642.aspx
http://forums.asp.net/t/1166634.aspx
I hope this helps.
Thanks,
Wendy
Wendy Li
TechNet Community Support

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