Upgraded to rails 3 and now I can't install plugins

I just upgraded to rails 3 and whenever I try to install a plugin, it acts like it’s installing and then when I try to confirm
that it was installed by going to the vendor/plugins directory, there’s never anything there.

Here’s and example of my install code:

rails plugin install https://github.com/Satish/restful-authentication.git

Thanks for any help!