Can not synch scope at start of sequence run

I am using PinPoint for plate solving. Out of running a sequence, I can load an image, right click it to select plate solve and it works fine.
When I start a sequence, the plate solve works but then an error occurs saying can not synch image with scope.
The scope is a PME and is working fine. It is also plate solving perfectly using its own Image Link. It is also performing closed loop slews perfectly.
Can anyone help me trouble-shoot this please?
I have tried to start the sequence both with PHD running and without it running. The same error occurs.
Many thanks
Jan