为什么每次在rails 3.2.1使用rvm重新启动后，我都需要“捆绑安装”?

For some reason everytime I reboot my computer I have to redo a lot of Ruby on Rails setup. I have to redo the "bundle install" to install all of the gems in my Gemfile, and then I have to reinstall rails with "gem install rails" even though I installed rails through RVM. I have never had this issue on another computer with other setups so I'm not sure what is going wrong.For some reason everytime I reboot my computer