Load the ePub into Sigil, remove the font code from the CSS. Remove the fonts, remove the font code in the OPF and forget about the modify ePub plugin (doesn't seem to work). Then you can do any other editing you need/want to do via Sigil.
Doing a conversion from ePub > ePub can cause problems you don't want. So this is why it's best to do the font removal via Sigil and forget converting. It's already ePub. It doesn't need to be remade into ePub.
Last edited by JSWolf; 02-26-2012 at 01:13 PM.
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