wp wont let me post >:(

i’m trying to use wp track my webdev ed but it keeps giving me errors.

a blog that doesn’t let you post is… infuriating.
is there a length limit? character restrictions? what gives?

i can kinda understand when there are html or php tags in the content. i’ve managed to work around that by x-ing out characters.

but today, it wont let me post a friggon nested list!
just says “Page not found”, suggests i search, and when i go back, my content is gone.

here is what i’m trying to post:
http://insubstudios.com/sandbox/really.html

i have no idea why i’m getting errors on that.
PLZ HALP!!