Very weird bug in Ghost… All of a sudden all the body text in the editor is grayed out. Everything still functions, and I can edit the text, but it's very hard to see(!)

What could be going on here?

* This is happening on all posts.
* It's happening in more than one browser.
* It's only happening for one of my Ghost installs (http://axbom.com), the others are still fine
* The text on the published site is fine, and everything looks good in previews

Any ideas are welcome.