Why wrong glyphs when previewing PostScript fonts?
This can happen due to bugs in the PostScript font renderer built into OS X. Unfortunately the OS X renderer does not produce the same results as ATM on OS 8/9 when using PostScript fonts in their traditional format; ie. a suitcase file with one or more printer font files (of type LWFN). The simplest solution is to use TrueType fonts instead of PostScript fonts. Selwyn Hollis has created TrueType versions of the CM and AMS fonts. Both hidden and visible versions are available at www.appliedsymbols.com/cmps/. If you only want to use the fonts with OzTeX then best to get the hidden versions to avoid cluttering up the font menu in other apps. Download and unpack the appropriate .sit archive, put the .dfont files in ~/Library/Fonts and remove any existing PostScript versions of the CM and AMS fonts. Restart OzTeX and it will use the new fonts.