I think my problems were just co-piole trouble. Everything seems to be working now. But yes, I can preview my font in the latest version of Sigil with no trouble. As long as the font is installed on my computer, I don't even have to have it in the epub. That works nicely when I'm just experimenting. I have noticed that even when everything is OK, If I validate I get these two errors:
Code:
The <language> element is missing
element 'svg' is not allowed for content model '(p|h1|h2|h3|h4|h5|h6|div|ul|ol|dl|pre|hr|blockquote|address|fieldset|table|switch|form|noscript|ins|del|script)'
I think the best validation is "Does it Work?"