"Time limit" is probably the least useful error message possible for diagnosis: the cause could be your mount, camera, catalog, plate-solver, or even the RA,Dec fed to the plate-solver by MaxIm etc.

So let me pose 4 questions I use to diagnose plate-solving, in order:
  1. On visual inspection, is the image any good?
  2. On visual inspection, does the image show the sky region you expected?
  3. Can you plate-solve the image in MaxIm, using a basic catalog (GSC or ATLAS)?
  4. Why are you using the catalog you're using? (I haven't used USNO A2 for many years--ATLAS is far superior, and even GSC should be sufficient for your image field of view).


Good luck with this.