Jeffrey, I found out what the problem is in the ePub edition of
Neptune Crossing with the text falling off the right side when going to a larger enough font.
The places that have the >>> are using <pre> tags which in ADE does not work well. Even desktop ADE has the same problem. It's an easy fix actually to remove the <pre> tags, change them to <div> tags,add in a <br /> to the end of each line and go from there. Then the lines wrap properly if need be.