ah jeez -I'm sorry. I've just found the issue. You prompted my thinking talking about it never being processed. I had checked message size, which was fine. But looking today, more closely, it was maximum actionable size, and the action being "reject" for some reason....so anything over 1mb...rejected

apologies, again, and thank you so much for getting back to me so promptly -and thanks for delivering a great product

cheers,
adrian