Hello mike2046
Just to let you know that after making the second changes of this post (on top of the ones you advise in your other post:
https://www.mobileread.com/forums/sho...d.php?t=172371), I managed to install Ie9 and create a Mobipocket eBook without a problem.
I went even further and tested with two levels of TOC (using heading 1 and 2) and they create and show perfectly in the TOC menus of the eBook reader(s).
Thank you very much for the work you have put on this situation.
Best regards,