First, check to make sure the fonts are embedded. If they are, it may be it just takes time to download the complete file and Reader is temporarily using a substituted font until all of the data is downloaded. You can try optimizing the PDF for fast web viewing (e.g., in Acrobat, select "Edit > Preferences > Documents > Save As optimizes for Fast Web View").
George: yes, the fonts are embedded and 'optimize for fast web view' is checked in Acrobat 8.1.5. Also checked, under 'optimize' is 'allow speculative downloading in the background', anyone know what this means? Oddly some pdfs have no problem displaying fonts, some have persistent font display problems, usually the first or second page only, while others have ephemeral font display problems, as noted above.
On another note: anyone know if Acrobat 8.1.5 is compatible with Office 2010? An Acrobat tab is visible but the pdf maker is non-functional. IIRC, Acrobat 8 worked fine in Office 2007 after updating.
Thanks for the pointers.
I've also had problems printing with Reader X.
When printing an attachment from an email in Outlook, if I don't open the attachment first, sometimes it doesn't print correctly as everything shows with the following number or letter. Example 12345 will print as "23456" and invoice will show as "jowpjdf". Even if I open the attachment, sometimes it will print the first page ok, but the next pages will "mppl mjlf uijt".
Never had this problem with previous versions.