Problem with new Plazes beta

I’ve been a user of Plazes since Ed Brill mentioned it a while ago. Today, Ed mentioned that there was a new Plazes launcher/client, called Plazer. I’ve loved it, and it’s a lot of fun to see where people are at, and to ‘discover’ new places. Well, I downloaded the updated launcher/client, but I’m having problems. When I try to log in, I get this dialog box:
A picture named M2
I love this service, so any help from anyone would be appreciated.

Once I get this going, if you are interested in Plazes (even if you never move around), instead of registering yourself, let me invite you. I get ‘karma points’ for inviting others. (Hey, if Ed Brill can ask, so can I!!!)