There seems to be a bug with Password Protected Pages. I have several pages that use the WordPress Password Protected feature. These pages have "Secure Post" under "HTTPS" checked. When the page is viewed, password entered, and submit is pressed, it leads to a blank screen. This only happens when "Force SSL Exclusively" in the HTTPS settings is checked. When "Force SSL Exclusively" is unchecked the page works properly. I have just updated to the most recent version of both WordPress and HTTPS (SSL). I haven't encountered this problem before.