On 2010-10-04 11:57:27 +1030, "David J. Perry" 
<[log in to unmask]> said:

> Ross and Will,
> 
>> So the first question should be what is the version of XeTeX that MikTeX
>> is providing.
>> And is David actually using that, or still an earlier version, as I was on
>> a Mac.
>> If the primitive is not there, then the latest versions of expl3 and
>> fontspec just will not work, and may not even succeed in loading
>> successfully. Is that not correct?
> 
> As the person  who raised the issue, I would like to help solve it.
> Unfortunately, the problem developed on my machine upstate, where I was for
> the weekend.  I'm now back in the city to teach tomorrow morning, and my
> machine here has not had the MiKTeX update that I applied this weekend.  If
> no one else sends in an example, I will certainly do so when I get back
> upstate on Friday.

On further reflection, even confirming that the "not-updated" case 
compiles correctly would be helpful. (As it would indicate 
approximately when the error appeared.) Can you prepare the same 
minimal example on your current setup?

Thanks,
Will