Rob, 2 things come to mind as first things to check:
1. If the star drifts out of the PHD screen very quickly I would question your polar alignment and second checking that you have got your mount tracing set to 'on'.;
2. check that on the top line of PHD under the 'Mount' tab that you have the right item checked. I thing the Orion starshoot has an ST4 out of the back that goes straight to the mount. In that case the item 'on-camera' need to be checked.
Peter
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