We've recently been messing about with the CRM & MOSS integration features, and while the initial setup of the MOSS farm on Kerberos authentication wasn't the most straightforward we are now getting issues when trying to conect two CRM webparts for filtering. This doesn't happen if we connect a regular web part with a CRM list web part. It happens only between two CRM list web parts.
The target webpart returns the following error:
"An error has occurred. This Web part could not be displayed. ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Conversion failed when converting from a character string to uniqueidentifier"
As an additional part of this error, on refreshing the page or trying to redefine the filter, the target webpart for the filtering also returns the following:
"Web Part Error: Web Part [webpart name] did not implement the GetInitEventArgs method"
So far the various forum threads we've looked at have vielded no fixes for this so we have now opened an MS Support Case. As soon as we get the results I'll update here.