[ChuckH]

I've also encountered this problem in iBooks, but usually only when an image/caption div block gets pushed to the next page (such as when the user resizes a font). Invariably some text will run onto the image; sometimes a few lines of the same paragraph will wrap properly. Some pages even have white space where the image previously was, even though the image & caption block have reflowed to the next page!

P.S.: I don't know how much good it will do but I've sent a feedback flame to Apple about this.