Hi June,
Am not sure what the editors mean with the AAF cut off by sample rate not by frame. FCPX uses fractions not frames, an AAF in ProTools uses frames. There will always be very slight discrepancy between a fraction and a frame. Happy to look at it if the Editor can highlight in a screen shot what they thought was wrong in ProTools and if you can upload the source fcpxml.
We don’t have a trial version of the code, I would suggest that you purchase it, try it, and if it does not do what your Editor wants then ask for a refund which the AppStore will do.
Hope the above helps.
Yours Sincerely
James.