Thanks to Anmari’s help, this problem has been fixed. The culprit was including punctuation (periods and colons) in the field headings. I removed them, and now everything works just fine.
Thanks Anmari!
Just resent it, from my GMail account this time. Please let me know if you do not receive it soon.
Thank you – email sent just now!
(As an example, if enter a comma-separated list of years counting backwards from 2013, it stops at 1982, even though the list I pasted in goes back much further.)