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I think (fingers crossed, knocking on wood etc) that I have this licked now.
I actually had 2 issues. The first was that my Optec rotator is set to rotate clockwise as its default. TSX however sets the PA from North counterclockwise. CCDAP adjusts for that but framing of a guidestar is thrown out when you bring CCDNav into the equation. I solved this by setting the rotate direction to reverse in the Optec control program. RTFM once again!
Secondly, I found that the FOV indicator in TSX has the guide chip rotated by 90 degrees from the orientation of my camera. So when I set up an image and set the PA, I think the guidechip is positioned over a bright guidestar, it is in fact rotated by 90 degrees – when imaging away from the Milky Way there was nothing on the sensor to guide on.
Its no surprise that I had issues. I set up a custom FOV indicator in TSX and managed to image 2 targets using framing set by CCDNav.
Thanks for all the comments - hopefully this will be useful for someone else.
Pete
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