It is some time later now, and I'm still unable to get to the bottom of this issue. If someone has any ideas, please let me know!
Let's just be clear. Which TOC are clicking on?
The one that appears in the application (ADE, iBooks) or one you created in InDesign that is part of the EPUB?
Thanks for replying.
I'n talking about the TOC that appears in the application. I did not create a second TOC with hyperlinks inside the book.
In the case of an ePub 3.0 export: clicking chapters in the TOC works fine with iBooks and Google Books, but does not work in ADE.
In the case of an ePub 2.0.1 export: clicking chapters in the TOC works in all readers.
Sounds like an issue with ADE. Are you using the most current version?
I'm using version 4.0.3 on OSX Yosemite.
I'd attribute the issue to a bug in ADE, but then why does the TOC in another ePub 3.0 export work as expected?
I'm thinking some setting in this specific Indesign project causes this in some way, but I've spent hours searching and troubleshooting without any luck so far.
You might get a better clue in the ADE forum. I’m kinda stumped.