Can't update posts – err empty response

I am receiving an Err_Empty_Response – no data received when I try to update posts. I run a photography blog, and I am trying to post a new blog entry, and it will only let me load about one photo at a time, save, and then if I try to upload another photo and save, I get Err Empty Response. I have called Go Daddy and they checked all their servers and said there was no issue on their end. I asked if I had taken up all my storage, and was told there wasn’t a space issue, either. I looked through some other forum posts and asked about Apache, but apparently my site has not been migrated to Apache. Basically, no fix or error was found on their end, but they did activate my error logs. This issue has been happening on multiple computers, IPs, even in different states. Does anyone have any advice/experience with this issue? I have not made ANY changes to my site recently, not so much as updated a plug-in.