Here lately about 5-7 wp websites I'm supporting have gotten this odd white screen. It happens at all different times, sometimes when you update a page, sometimes when you edit a page, sometimes after you've just been logged in for a long period of time and you're updating. There's no solid connection between all of these sites. They all use different plugins. This is really killing us at our company trying to support this- any information we can get would be super, really great!!