Visual Editor won't work after upgrade

I know this topic has appeared in other threads, but I tried everything they suggested and it still won’t work.

We just upgraded from 3.5.1 to 4.0.

On one page, we can’t get the visual text editor to show the page. You see white with red squiggles. If you highlight the seemingly blank page, you can see the html code as if you were in text mode and the font of the text was white. But it doesn’t show the visual page.

This particular page has about 10 images, but they are pretty small.

If I edit a different post, it works fine although it takes a few seconds to show which is more than before the upgrade.

I’ve been reading on the other posts that this problem first appeared when going to 3.9.

I’ve tried everything they suggested:
installing the Google Libraries plug in
Setting memory limit, setting language in wp_config
switching to theme twenty eleven, disabling plugins, and clearing cache

Nothing works. Problem still persists in twenty eleven with no plugins running except Google Libraries.

Help!