Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Process Designer Adapter state seems to be tempered, please ensure valid security parameter is passed

Where I can change trust level?

Can you check the value for Use Http Context under Check the URL Encryption Setting category in Skelta Farm Configuration Wizard

1) Open Farm configuration Wizard
2) GoTo Service settings Page
3) Global setting -> click on image in the right
4) GoTo Http Tab

Please check the attached image, if this value is set as true please change it to False and then try.

regards,

Moderator

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1) Go to C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\BPMUITemplates\Default\ProcessDesigner

2) Set ValidateRequest="false" in Page directive for the following pages

       a) XmlStorage.aspx

       b) XmlIterator.aspx

       c) XmlSpList.aspx

       d) XmlInfoPath.aspx

It's not helped

But I locate source of the problem: error appears only if workflow name written on my native language (russian).