So I download and enable adaptivetheme. It's the only theme on my machine (Mac OS X if that matters).
$ drush @my.local adaptivetheme "RA Theme" ra_theme
/profiles/ra/themes/contrib/adaptivetheme/at_coredrush: The directory "/profiles/ra/themes/contrib/adaptivetheme/at_core/../at_subtheme" was not found.
Drush command terminated abnormally due to an unrecoverable error.
The fix is actually pretty straight forward I think, will supply a patch momentarily.