Hey I have the EXACTLY the same problem… (edit page bombs to front page on save/save&continueediting.
i am a wp newcomer, with
wp2.1.1 & a slightly tweaked default theme.
firefox (although have tried with IE)
(indeed i get the same problem with other themes, so I have ruled that out)
I ONLY get this problem when I try to upload markup or non-standard characters. (for instance including an image) incidentally I DONT get this “bomb out” with plain text.
Tried swiching off the wysiwyg editor for my user,
forcing everthing i could find to utf-8 (in wp and .htaccess file)
but to no avail
its really doin my head in. Something as fundamental as including images not working “out of the box” is a bit groanworthy….
im on day 2 of it already…..