Editor stripping accents from text

Recently updated to FCKeditor 2 RC2 from 1.6, and everything is up and running well... except for one thing.

The problem is it strips all the accents from the text that I type. It happens regardless of whether I do it in the source or not.

Any ideas what I could do to fix it?

XHTML is disabled, and I'm using fckeditor.asp. It happens when I use both Firefox and IE6, and I'm running WinXP. I haven't changed anything else, to my knowledge, except some File Browser stuff.

thanks