This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Usually, question marks are a sign that for some characters in the source text there are no characters in the font that is used to generate the PDF. Now, for a space symbol that shouldn't happen. Have you ascertained that the sequence of characters contains only exactly the characters that you think it contains, i.e. that there are no control characters or characters higher than ASCII 127? I would also check whether the fonts being used on both machines are identical, and that they have the same selection of fonts available. [ November 02, 2006: Message edited by: Ulf Dittmer ]