Unable to open EPUB 3.0 files

[sdwareham]

I'm using ADE 4.0.3 and i'm having trouble trying to open any EPUB 3.0 document. eBooks created as EPUB 2.0 are opening fine, but when I try to open an EPUB 3.0 document I get a message saying "unable to open....errors were encountered in this item.

I have tried opening EPUB 3.0 files that I have made myself and pass the EPUBCHECK validatior.

I have tried opening EPUB 3.0 sample fiels from epub-samples - EPUB 3 Sample Documents - Google Project Hosting

I also tried creating a very simple EPUB 3.0 file out of InDesign CC.

All with the same results so far. Is ADE fully compatible with EPUB 3.0? The release notes say it should be able to open these files, they do open with all other eReaders I've tried. Am I missing something with how ADE works?

[Flawless_Unicorn15C3]

I am facing same issue, please help... How to resolve this issue?

[sdwareham]

I'm also finding the same thing. ADE cannot open epub 3.0 files. I can't even open the IDPF epub on the epub 3.0 specification. I'm using 4.5.1 and trying to open valid epub 3.0 files that pass epubcheck. Is this a bug, or does ADE not really support epub 3.0?