Hi GrannyGrump you have set a new category of epub: the crashing one!
Kidding, but indeed your epub has crashed my Sigil.
Are you sure that:
Code:
hyphens:none;
-epub-hyphens:none;
-moz-hyphens:none;
adobe-hyphenate: none;
-webkit-hyphens: none ! important;
is valid within css 2.1?
Maybe you can try something like:
body { adobe-hyphenate: none; } it seems to works at least with the Kobo.
Also, Sigil is complaining about x-font-truetype and suggests x-font-ttf. If you get rid of that, and "hyphens: none;" and al. the epub has no problem with epubcheck.