Mac user cant connect either
 

I have also tried everything and I cant connect. I have checked with my service provider....no issues there. I checked to see if my router was ok....OK there........emailes someone named Zenzele (I believe) & he stopped emailing m back......We pay good money for these programs how about some help!!!!!
I have OS X, latest version on a G4 with a cable modem. It used to work great.....
what happened.

The Quicktime upgrade is giving some problems . Details here http://www.info.apple.com/kbnum/n93414 , but it's a long shot (not really a connection issue)

Looks like you tried everything else. I had a similar problem with uploads, and it turned out even the ISP's help desk wasn't informed that filesharing was being throttled.

Have you tried connecting directly (bypassing the router) to see if that makes a difference?