Without looking at your epub it's hard to tell, but make sure that the font names are referenced in exact case from the CSS. Best thing would be to post a problematic epub (or if it can't be posted for copyright reasons, try to reproduce the problem in a test one) and have someone take a look. Most of my font rendering problems were incorrect case on the font name, although I remember running in some stencil-type font that wasn't rendering correctly by ADE.
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