Hi
This is a different error now - not the security error!
A great way of diagnosing these kind of problems is by using Fiddler (or IE's F12 profiler) - you can capture the request/responses and see what is going on.
Your error basically indicates that one of the requests generated from calling SaveChanges has resulted in an error - using Fiddler to look at the requests will enable you to identify which one and resolve the issue.
hth
Scott Durow
Blog www.develop1.net
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