Eventually I brought the .jpg's into photoshop and saved as .png and they all worked fine after that.
So, in my case, coded everything in Sigil, using .png format for the illustrations, imported into Calibre and saved the .mobi file out of Calibre.
I also decided to have each illustration start a new page/chapter so that Kindle didn't try to "split" the illustration and its caption.
Thanks for the replies.
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