We have a font that we're developing in FontLab in which the standard fi and fl ligatures will not work in Word 2010. Unfortunately I'm not sure of the origin of the original font, but even if I remove the other features, add just a standard liga feature with the fi and fl substitution, it doesn't work. The ligatures for our newly generated font DO work in InDesign (CS3 and CS6) and CorelDraw so it seems to be a Word 2010 issue.
In trying to figure out what is going on I've been investigating other fonts, some whose ligs work in Word 2010 and some whose do NOT. One font whose ligatures do NOT work is Times New Roman (again, the ligs DO work in other programs). Opening that in Font Lab I don't see that the fi and fl are in the liga feature at all. Nor have I been able to find either glyph name or Unicode in an exported features file.
Does anyone know what might be causing this in Word 2010 or how the other programs might be getting the ligatures from the Times New Roman?
Thanks for any clues anyone can offer.