See attached sample page. We have tried on PC and Mac. We have latest INDD. It works when we export to PDF. For epub we tried also to export to IDML and then to epub same error.This is fixed epub.
And try viewing in standard, vanilla readers like Thorium. Many EPUB readers including Apple's have quirks and proprietary features that can cause problems with otherwise simple, compliant documents.
Thanks Willi. Adobe support said to replace our "Brandon Grotesque " font with another font but we have printed the book. We are a book publisher but also need an epub version. The book renders correctly in ibooks but not in ADE on PC or Mac. Thanks for any suggestions.