VsDebuggerCasualityData - wcf

I have a .net 2.0 app on a win2003 VM that calls a WCF service hosted in IIS7 on a win 2008 VM. After developing the client and service and testing (all was good) I took the opportunity to take a snapshot of both VMs.
I come back to the VMs two weeks later and when I make the WCF call from the client I get a message dialog on the win 2008 server with the caption "Visual Studio Just-In-Time Debugger". The dialog then reads "An unhandled Microsoft .Net Framework exception occurred in w3wp.exe etc.
I take a look at the WCF service log an now see the following in the "WebHeaders" element:
"VsDebuggerCausalityData" AwAAAOEhpa2...lots of AAA
I've tried reverting both VMs to the previous snapshot but get the same problem.
In the WCF service trace file, I can see the logs entries from just before I took the snapshot and the request / response messages look perfect.
Could anyone please advise next step for diag and fix?
Many thanks
Rob.

Try to invoke WCF from wevservice studio. If you can do it , the problem
is in server.
If problem is in server , you can trace where exactly do you fail
Trace can be done using
http://msdn.microsoft.com/en-us/library/ms732023.aspx

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