Unable to open gems managed by rbenv

[tylernm14]

I'm using vim 7.4, vim-rbenv, and the latest vim-bundler code, and I'm having trouble with :Bopen <GEM_NAME>. :Bundle works for me as expected but :Bopen is returning the error "Gem <GEM_NAME> is in bundle but not installed". Also in my Gemfile.lock all ruby gems are highlighted as not being installed. Heres the output of two commands run from within vim:

 !ruby -rubygems -e "print Gem.path.join(';')"
/Users/tylernm/.gem/ruby/2.3.0;/Users/tylernm/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0

:!ruby -rrbconfig -e "print RbConfig::CONFIG[\"ruby_version\"]"
2.3.0

which is the exact same output as on my command line shell (zsh). All this seems to point to a gem_path issue. Do you have any tips on how to debug this further? Unfortunately I'm very new to vimscript. Thanks.