Hello Edward,
I recall a similar problem with an earlier version of the PDF manual that a customer was viewing in Adobe Acrobat. But the manual has been updated since then; when was the last time you downloaded it? If my understanding is correct, you shouldn’t need the fonts that were used in order to view the PDF correctly.
If you have the latest version of the manual <
http://downloads.extremesims.com/omn...1.5-Manual.pdf> and it's still not working properly, please let me know and I'll see if we can do something more to help.