This is a strange bug that is happening on my WP 2.0 upgrade from 1.5.
After publishing a post, if I try and go back to edit that post and submit, the post itself will be updated, but the text in the edit box will not be updated. Even after refreshing the browser, closing the browser window and opening it back up again, the previous version of that post will show up in the edit box. So if I wanted to edit a post twice, I would essentially have the first version in the edit box even after I've edited it once already.
Sorry if that explanation is confusing, but I don't know how else to describe this.