Thanks Stephen.
I’ve discovered that the problem is more specific to Premiere. The timeline runs ok in FCP even in preview but back in premiere is very jerky with the Motion 5 effects. Today I tried rendering and it did some very strange things – the footage was all magnified and elongated as well as being very pixelated. I would really like to be able to work with the footage in premiere as I use Encore for DVD authoring.
Mike