Problem with line spacing

Hello,

I'm having either a display problem or an editor problem with line breaks on posts. I have to hit the enter key twice to get a line break in the post.

While that fixes the issue on the single post page, some of the widgets that display posts will show the double break. Both visual and html views show a double break, but the post is displayed with one break. If visual and html show a single break, the post shows no break. Very annoying.

Any ideas?

FollowUp: The <p></p> are getting saved and they are there when I view the post source. They are just not getting rendered with the extra line breaks normal for the <p> tag. Is this something is the css?