This problem just started about a week ago. My website has a page called Triathlon Calendar 2013, which is a compilation of all triathlon events in every state. Yesterday I spent about 4 hours adding events and when I clicked update, the page went blank. I can see the page but when I go try to edit it, it's blank. I thought it may be a theme related incident so I changed to 2012 theme and had the same problem. I also tried disabling all plugins and still had the same problem. Occasionally it will let me edit the page but the problem will eventually come back. I do have a plug in called WP-SWFObject. I don't know if this is causing me problems. That page is what draws a lot of traffic to my site and is important for my business. I am very wordpress illiterate so any help would be greatly appreciated.