My Indesign files, the font "WinSoft Pro Medium" appears as missing font whenever I open the file, when I try to solve this problem (by replace the font with another one) there is no action happened, moreover, when I search for a text have this font. I have nothing. Have anyone a solution for this problem and why this happened?
my answer might be rude and pompous, but if you wan't to limit problems with fonts, there are two essential rules: don't use free fonts, don't use TTF fonts unless you know well the foundry which made it. And by the way, loading your fonts with a font manager (FontExplorer, Suitcase...) is a plus, as they have font bug detectors and conflict manager.
How are you trying to replace the font? Using Type > Find Font?