[XeTeX] A XeTeX bug or a MiKTeX bug?

[VAFA KHALIGHI]

If You use MiKTeX (updated at 2008-02-26) and you typeset persian or arabic
where you need to have ZERO WIDTH NON-JOINER between some words, it does the
job well. But if you update MiKTeX (let's say today) and do the same as
before it makes a gray like vertical line between the words that you used to
have ZERO WIDTH NON-JIONER between them. I actually have put an example on
the web and you can get it from
http://tex3.141592.googlepages.com/BeamerPersianPresentation.zip

I have done this by using the newly updated version of MiKTeX and when you
look at the pdf file, you will observe the those gray vertical lines that I
was talking about.

So is this a XeTeX bug or a MiKTeX bug?

Thanks


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