That indicates an encoding issue. Sigil assumes utf8 (utf8/16 are the only valid character encodings for epub). When you get those little black question marks, it means the file you added wasn't utf-8--and Sigil is displaying it with the assumption that it is.
Note that adding the utf-8 declaration to a file does not actually MAKE it a utf-8 file.
You're likely dealing with some special characters in a cp-1252 encoded file.
Last edited by DiapDealer; 05-05-2014 at 10:46 AM.
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