Greg
I find that TSXP will platesolve every image I send it. Tise wasn't the case initially though. The image angle isnt the problem but the plate scale needs to be correct. You also need to check the source extraction options so that it only finds relatively few stars in each image. I use a 5 sec exp with autodark in CCDSoft through either a V filter or a clear filter.
Change the source extractions so that 10-50 stars are found and use the unknown image scale choice until you get a match then change it to a known image scale.
Good luck
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