If you are doing the image link through the GUI, perhaps you have to manually save the image? I never really checked what VPhot thinks, AIJ reports the resulting images correctly plate solved.
I run a script to do it using this class. I use TSX to plate solve my images and find that WCS are correctly stored in the FITS header by that program. I don't have very many posts on the Bisque forums so you can probably just search for my name to find this thread there. Either that or maintain an accurate TPoint model and 'assume' the coordinates for my target will be close enough. I was advised that if my pointing is not accurate I should update this information after a slew by performing a Star Synchronization via Telescope/Startup. I have it directly from Bisque that the fits header is informed by where TSX thinks (I am paraphrasing here and this is not a direct quote from Bisque) it is pointing even if the target was acquired by Closed Loop Slew and even if an Image Link was performed after the slew (I do this to calculate and record the position angle). I found this out the hard way as i generally rely upon plate solves to locate my photometry targets and neglect/disregard pointing errors(TPoint). I use The SkyX Pro also and this program does not inform the fits header after a plate solve (Image Link or Closed Loop Slew).
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