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Thanks for the help - it's definitely a font issue. Your suggested file displays the same problem that achemso does. Using pdflatex produces the correct output. The log file from running pdflatex on my example.tex shows some font shape replacement for unavailable shapes, but that's as much as I can ...

It sounds as though you might not be seeing the problem I'm having - it is not the one you just described.

In the example.div I posted, when I view the first line of the file, it reads

a +b =c

There are no numerals displayed at all, regardless of size or typesetting. The only way I could get them ...

Thanks for the interest, everyone!

Here's an example. Example1 is compiled using achemso.cls, example2 is using article.cls.

Incidentally, when I compile the demo file it has the same problem, which is why I believe this is a problem with my install - I just don't know what to do about it.

I am trying to format a paper using achemso.cls and found a fairly bizarre error. The compiled .dvi does not display numerals or the "-" sign while in the math environment, both in line using $..$ and using /equation and the like. These are the only characters I've tried that are affected - letters ...