[XeTeX] Problems with fontspec and mathspec

[Will Robertson]

On 2010-05-13 00:04:29 +0930, Tobias Schoel 
<liesdiedatei at googlemail.com> said:

> Removing the option cm-default from mathspec (which passes it to
> fontspec) results in no error-messages and the desired effect.
> 
> Why is this?


cm-default was originally intended for users of fontspec who didn't 
have the Latin Modern fonts installed; nowadays it serves less purpose.

It's not entirely clear to me what is triggering that error, however. 
(Without having looked into it in much detail.) Is this going to cause 
a problem or is the current behaviour workable?

W