Aliases don't work for enabling modules

[MatthewHager]

When I try to enable a module using a site alias I get an error:

camcms.com[master] $ drush @camcms-com en camden_cms_core
Command pm-enable needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.                                               [error]
The drush command 'pm-enable camden_cms_core' could not be executed.

[ergonlogic]

Yeah, I've started seeing this recently too. It looks like we've lost 'uri' in our aliases in some recent re-factoring.

[MatthewHager]

This isn't working after upgrading. I'm going to attempt rebuilding my box and see if that will fix it...