I hub hop both on Hub Pages, and also rate Hubs for Mechanical Turk. There must be a technical issue that is keeping you from using the Hub Hopper. I would suggest trying a different browser, and see if that makes a difference. I'd report the issue to HubPages as well, and see what they can do to help you. Hub Hopping is fun, and I think it's really useful to all of us a HubPages since it keeps the quality up. It also gives you a good sense of what makes good and bad hubs, which can improve the quality of your own hubs. I hope you get this problem solved, as I'm familiar with your excellent hubs, and think that you would make a great hub hopper!