File changed during load

I have observed a strange thing during the last time. Whenever I open an 
XHMTL file to edit with nxml-mode it is already changed when I start. I 
can undo the changes, but I can not see them. Something is changed 
before the first character it looks like. If I use undo two times I get 
to "No further undo information". Those two times makes me wonder.

Is there someone else that has noticed this? I am running the latest CVS 
version of Emacs on MS Windows.


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