Oops! My bad! Fixed it.

Thanks again!

First of all, I can’t find post_content_ifr div id anywhere in the source.

I tried the following code and it ain’t working. Any other thoughts on this?

#post_content{
        width: 100%;
        min-height: 238px!important;
        display: block;
}

If I’m to update the core files, that won’t be an issue for me as even after any update, I can do the same thing to get it back working.