Quote:
Originally Posted by JSWolf
Currently Calibre's subsetting doesn't take into account reading software that makes ligatures and if the ligatures are not already in the text, the ligatures are gone.
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That shouldn't cause the problem you are seeing, unless it doesn't remove the ligature table; i.e., if the font file is left with a table indicating that the combination "f + j" should use the glyph name "fj.lig", but the "fj.lig" glyph is undefined or blank. A good subsetting should either keep or remove both together, the table and the glyph (a better subsetting should keep both only if "f" and "j" are also included in the subset).