Extended characters: The new software seems to take exception to valid characters outside the USASCII range. I've been using Greek letters as placeholders and they are being turned into question marks. For me this is a ruddy nuisance, but for people writing science fiction or anything technical, it could be a lot worse. Alpha, Beta, Gamma, Zeta, Sigma, Kappa, Epsilon and the rest all have valid codepoints, upper and lower case, in the Basic Multilingual Plane.
Ok. Looking into it.