[bobcdy]

Thanks for the info.
- theducks. I'm not entirely sure what you mean by html entity, but I think you meant creating a web page on which the correct glyphs are visible, then importing it into sigil, adding the proper fonts, and creating an epub. I tried this but had no better results than before. I also used Calibre to convert the html, with the same results for Adobe DE.

-CazMar. I thought about using images and I might use an image for the short paragraph if I can't do it any other way. The Greek is in a footnote and is not really important but I like to have everything in the epub that was in the original google book pdf. so I dislike just leaving it out (I also thought about omitting the text and have "(Greek text)" in its place.

I found a few web pages that discuss ADE/diacritics and the general conclusions seemed to be that Adobe DE decided not to support them except for special cases. Perhaps I'll have to use the image method...
Bob