Save error and Posts not showing up

When I edit or create post, I update (save) the post and when I click on something else, like another post, I get the following message:

“Are you sure you want to navigate away from this page?

The changes you made will be lost if you navigate away from this page.

Press OK to continue, or Cancel to stay on the current page.”

I kept clicking on update, but the message never went away and happened on other posts that I edited.

Also, I have about 15 posts, but only about 10 are showing up on the sidebar. In the widget area I checked that I have a large number for how many posts to show, so that can’t be the problem.

Recently I had some other trouble and someone was kind enough to suggest putting my permalink on the “default” rather than custom. So I’ve done that but wonder if something else is wrong with structure of my site. here is the website: http://www.fancyprincessdress.net

Any ideas?

Thanks