Bob, according to the 4.1 release notes there is supposed to be some new Sync setting for the computer/progressive input that you can toggle in the Picture menu somewhere.
"Sync Slicer control in the Picture menu allows a broader range of use with Progressive DVD players. The default value works for the large percentage of the DVDs and the other option allows those others that have issues to function. The sync Slicer menu option is only available for the computer input. "
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