Well actually this happened to me also for Wupload & FileJungle wasn't loading for me.
So I changed the DNS to Google and now everything is working fine.
Earlier I was using OPENDNS - but 2 days earlier I was getting an horrible message.
Most of the domain was blocked by my network - from facebook,any filehost you name,torrent sites,etc.....
So I changed to Google DNS and everything went fine.
So I guess who ever faces the same sort of issues just simple change your DNS to Google's one.
Regards