On a page, when I edit the css, after publishing the changes, upon refresh the code that was in the css box is now gone.

I’m getting error on some of the post types:
Uncaught TypeError: Cannot read property 'value' of null
– it is blocking iframes and causing a lot of other trouble, is there any fix for that?

I’m using Perth(lastest version) theme and latest wordpress. After i’m disabling plugin everything goes back to normal.