[GrannyGrump]

I am having a (first time ever) crashing problem with Sigil 7.4, running both on Win 8-64-bit, and on Vista x86.

Only one particular page in one particular book is giving problems.

Flight Crew and Pagina epubcheck report "No problems found." W3C validator reports the following embedded font-related error messages.

font-family Property font-family doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : "Iota"

Property src doesn't exist : url(../Fonts/Iota.ttf) format("truetype")

Value Error : font-style Property font-style doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : normal

Value Error : font-weight Property font-weight doesn't exist in CSS level 2.1 but exists in [css1, css2, css3] : normal

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I have used this custom font before without problems, and the page in the epub that is having problems does not link to this font, anyway.

The epub is only five xhtml files. The second and largest (181kb) page named multiIndex.xhtml is the one that seems to be the problem. It does happen to be the only one that currently has any links assigned, so maybe I crippled the links and can't see it.

I have turned html tidy on and off, and even built a new epub from scratch and copy-pasted each page into Notepad++ and then into the new epub (in case there was something twisted in the code). Sometimes I can work for a half-hour or more with no problem, then suddenly a simple click on the problem page results in a crash.

Either this is something so simple I just cannot see it, or it is something so complex it needs expert eyes. I'm attaching the epub, in case you would like to take a peek.

Does anyone have ideas?

EDIT: Oops, I forgot to generate the TOC and html TOC on the replacement. Here is the edited version: