I'm having the same issue described in this thread:
http://forum.bytesforall.com/showthread.php?t=8208
I've applied both the fixes listed in that thread, but I'm still having the same issue - I can't change my meta tag title format from Page Title - Blog Title to Blog Title - Page Title. Every time I choose the second option and click "save," the change isn't saved.
I also can't switch the Meta Title Tag Separator from the default option, which is "1"
My website's URL is http://www.bloggingblue.com
I'm running both WP 3.0.1 and the latest version of Atahualpa (3.5.3)