Apologies for reviving a long-dead entry, but I wanted to ensure that anyone coming up on this while searching for a fix for the white text on white background would see this (as this is the second entry in Google for “white text in wordpress editor”. The problem for me was the PS Disable Autoformatting plugin: in the file /wp-content/plugins/ps-disable-auto-formatting/js/280/ps_editor.js it sets the color to white, among a bunch of other unexplainable things. If you edit that file and comment out the line that looks like this:
$(‘#content’).css(‘color’, ‘white’);
you should be all set.
