For me, wp-admin/edit.php (the Posts page) in the Dashboard was simply blank. No errors in the browser.
Swapping to a newer theme made the Posts page render properly, as did duplicating the site (within our Multisite deployment - thanks NS Cloner!) and using the same theme (and plugins & settings).
Activating('WP_DEBUG', true) revealed Out of Memory errors being generated by wp-includes/wp-db.php each time I navigated to wp-admin/edit.php.
I began disabling plugins one-by-one and found Google Analyticator to be the culprit.