Created attachment 54516 [details] PDF file generated by OpenOffice comparing results using "Simbol" and "Standard Symbols L" fonts. Version: 0.10.5 (using KDE 4.4.5) OS: Linux To be more specific, the characters that are not displayed correctly are: Delta (uppercase) Omega (uppercase) mi (lowercase) pi (lowercase) Reproducible: Always Xpdf shows the characters correctly.
Not a bug, you are not embedding the "Symbol" font in the pdf file so it is querying the system for the "Symbol" font as is giving you one that has a charset not compatible with the "Symbol" font. You might want to read http://freedesktop.org/wiki/Software/poppler and define your "Symbol" font to be a "Symbol"-compatible font