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Mike, on looking at your image again it appears that the stars are all pointing in the one direction. Are you using a guide scope. If so then this could well indicate that your guidescope is slipping in it's bracket.
If it is unguided then I would say that your camera is slipping in the focuser or the SC sleeve on the FR is slipping.
The thumbscrew is to allow you to rotate the camera if you have the FR attached to the thread of an SCT. Keep your thumbscrew tight for use with a refractor. If you have an Orion Prime Focus adapter remove the silver barrel and replace the black one from the WO and see if that gives your focuser a better grip to prevent slipping.
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