[XeTeX] Mysterious error

[Christos Chryssochoidis]

Hi all,

I'm trying to typeset a document with xelatex, and after writing some  
pages, in which I also insert some external pdf's made with MpToPdf, I  
'm getting a mysterious error:

> *** no 'post' table found, unable to re-encode font lmmi10

(and in TeXShop console it also says something about 'broken pipe').
Can anyone help me with this?

I'm using XeTeX from MacTex-2007 on Mac OS X 10.5.1.

c.c.