I have this same exact problem. I have checked with my hosting provider and they say it is nothing to do on their side, and they did extensive testing. Apache did not return any errors,etc. I thought perhaps something was timing out b/c of the long upload time.
My page’s word count is 13,978. I have never had this problem on pages that contained much less content which tells me it is probably isolated to the legnth.
Can someone please share some advice as to what is causing this? Seems to be a script problem in WP.
