Thanks. I couldnt download smultron but today i decided to work on this issue. So when i was searching the hosts file in my mac i found another one which was used for youtube allowance before (because it was not allowed in the country there was this hosts file change thing). I deleted the youtube lines there then i found the hosts file in /etc folder and replace it with the deleted one AND THE PROBLEM SOLVED! so happy for today:D And thanks again for pointing out that folder issue!
I'm experiencing same problem here. I did what you suggested lookup and ping things, but the result looks a bit weird......
Ping has started…
ping: cannot resolve youtube.com: Unknown host
Lookup has started…
youtube.com -> The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)
Do you know what these mean???