Something appears to be wrong with Blogger‘s API server, so AvantBlog authentication is very touch-and-go. I’ve modified the program slightly so that it reports properly when it can’t connect to their server, so at least you’ll know what’s going on. Also, on suggestion from Ron, I’ve added a ‘Try Again’ link so that you can log out/log back in again and see if their servers are responding properly.
This problem appears to have been happening for the last couple days at least, so let’s just hope that Blogger sort it out soon. I wonder if their fancy new Atom API is going to be any more reliable?