I've modified two glyphs in a ttf "pi" font. Trying to use the generated font, I see the glyphs in InDesign's Glyphs Palette, and I can insert the one I want - but all the Unicodes are "NULL". Probably because of this, when I try to change my character style to use the new instead of the original font, I get missing character boxes in ID.
This happens whether or not, having opened the original font in FontLab Studio 5.1.1, I do Generate Unicode followed by Generate Names - though when I do that, the Unicodes are correct in the font window (as they were in the original font).
I have used preferences that, based on the FL manual, seem appropiate for doing minor mods to TT fonts. What am I doing wrong? Any ideas?