Editor showing white text

The Editor is showing the text as white (on a white background) so unless you highlight the text, you can’t see it.

When the page loads, if the CMS remembers that you were last in Text mode (likely due to cookies), the text in the editor appears white on a white background. This makes it look like the text box is empty, even though it’s not.

This CSS line seems to be causing the issue:
.js .tmce-active .wp-editor-area { color: #fff; }