I reset it. It didn't take all of my changes but I was able to quickly find them in the old CSS. I should have done that a long time ago!

Note: I was using the Blix theme and some of the CSS was carried over. That may be part of the issue but I've made so many changes at this point that I cannot go back to the original theme CSS.

This is what I know:
CSS is theme specific. If you have custom CSS and later change themes, you need to delete whatever CSS you have in the Editor, otherwise, you’ll get undesired results.

To ‘reset’ a theme, you need to delete the CSS in the Editor, make sure the “add to existing CSS” radio button is checked, then save. Things should go back to normal.

The width of the content box of any new posts and pages is off. (See examples below.) It's fine on my older posts but not any that I've recently published. The width was also ok when I made a copy of an older post and then re-published. (http://dietitianduo.com/2012/10/23/nutri-news-2/).

Also, when I make the browser window smaller the responsive width works with the POSTS, but not PAGES.

Any ideas on either of these issues?

EXAMPLES:
http://dietitianduo.com/services-2/
http://dietitianduo.com/2012/10/23/test-2-2/
http://dietitianduo.com/2012/10/17/test-2/

Note: I was using the Blix theme and some of the CSS was carried over. That may be part of the issue but I've made so many changes at this point that I cannot go back to the original theme CSS.