The basic problem is :
· User opens form in InfoPath Forms Services
· Changes view
· BOOM – gets an error + correlation id [Security Validation]
This error was found by Chris O’Connor in our Dev box. So I post here as I need do the same thing to our production servers.
Here is the fix but not a very good option
Fix is as below:
1. In the 14 hive, under template/layouts, find the formserver.aspx file.
2. Backup the file and then edit it with any text tool, say, notepad.
3. Under the <body> tag, add the highlighted line of code.
<body runat="server" id="PageBody">
<SharePoint:FormDigest runat="server" />
4. Save it. Then the problem should be resolved.