I have this problem periodically with our website -- it's not the server, as I can upload/change any HTML pages fine, but the problem only occurs with WordPress. I wrote in about a year ago, things sort of recovered on their own -- I didn't do anythihng different. It was down about 5 days. Since then, sometimes an upload attempt stalls with "could not load any data from this location," but if I clicked enter about 20 times, it would eventually work (very time-consuming and frustrating.) But now, even clicking enter endlessly doesn't appear to help. What to do? Has an update been made recently? I found that others have had this same problem (see http://wordpress.org/support/topic/10547?replies=4).