Have you recently updated WordPress and then noticed that your post area looks blank when you edit existing posts or pages?
I noticed this after going through the hassle of upgrading to WordPress 3.3.1, and manifests itself as white text being displayed on a white background when your post edit page loads. You might also find that switching between ‘Visual’ and ‘HTML’ modes doesn’t work either, and the wysiwyg icons don’t display.
Having looked through loads of forums and support groups, with various suggestions such as uploading the WordPress files again, clearing cache, and switching off plugins, I came across a random suggestion that has appeared to fix the ‘white text on white background’ problem for me.
Try installing the Use Google Libraries plugin, then clear your browser cache and try again. If this works for you then it suggests a problem with one of the WordPress libraries or files in your install, as the plugin will go off to Google’s libraries to get the files it needs instead. This could also improve the performance of your site too, as you will be making use of Google’s content delivery network and it’ll reduce the load on your server too.