I'm also very impressed by the many new features that you guys added. Unfortunately, I also found a bug in the inline TOC code of the 32bit Windows version.
When Sigil 0.5.905 first generates an inline TOC, it uses the following address format:
<a href="Text/file.html#toc_marker">Chapter Title</a>
This works great in Sigil 0.5.905, but it doesn't work in ADE. The format should be:
<a href="../Text/file.html#toc_marker">Chapter Title</a>
To replicate this issue generate the NCX TOC and then the HTML TOC. Validate the epub. Flightcrew will complain about unreachable files in the <spine> and <manifest> sections.
The weird thing is when I opened the very same epub file again, all HTML TOC links were displayed correctly even though TOC.html was still missing the ../