DHonks, if you open up a command prompt (not sure where this is on a mac, but its definitely there), do a: > telnet static.yuku.com 80 and > telnet images.yuku.com 80 it should look something like: telnet static.yuku.com 80 Trying 208.87.216.100... Connected to static.yuku.com. Escape character is '^]'. if it doesn't say "Connected", then you likely have a firewall or web filter blocking access to those sites. If it does connect, its might be a web proxy that isn't caching properly, or the firewall is doing some kind of packet inspection that doesn't like something in the code, or something at a much lower level. Of course, none of this is likely to help much, but it may be useful for the network admins if you want them to fix it.