I was running ruby 2.0.0-p247 on my Mac Mini Server (Mavericks 10.9.1). I read that there was a security vulnerability so I decided to upgrade to use the latest Ruby patch 2.0.
looks like a bug, please open a ticket here: https://github.com/wayneeseguin/rvm/issues
Indeed this was a bug, to fix it run:
rvm get head rvm gemset reset_env
you can repeat the reset_env operation for every gemset that is broken:
reset_env
rvm ruby@gemset do rvm gemset reset_env