CSS visiblility setting throws of TOC generation in MOBI

[Guido Henkel]

I am using images to start my chapter, not text.
In order to auto-build a TOC in Calibre I am inserting text for the chapters and use CSS to mark them with "visibility: hidden" so they don't show in the text but can be processed for the TOC.

It works perfectly for ePub files but when I build MOBI files all the links in my TOC point to he beginning of the book. As soon as I take out the visibility property it works fine.

Is this a bug or am I doing something wrong? Is there a better way to create a TOC with text entries even if the chapters begin with an image saying "Chapter 1?"

Thanks for any help or ideas.