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New information This is what happens with rails console : Loading development environment (Rails 3.1.1) ruby-1.9.2-p290 :001 > RUBY_VERSION => "1.8.7" There's something really weird going on here - the prompt says 1.9.2 but RUBY_VERSION shows 1.8.7 . I'm using RVM, but I'm having problems with Rails on Ubuntu. $ which ruby /home/nick/.rvm/rubies/ruby-1.9.2-p290/bin/ruby $rvm list rvm rubies => ruby-1.9.2-p290 [ i686 ] But if I do gem env I get RubyGems Environment: - RUBYGEMS VERSION: 1.8.11 - RUBY VERSION: 1.8.7 (2011-06-30 patchlevel 352) [i686-linux] - INSTALLATION DIRECTORY: /home/nick/.rvm/gems/ruby-1.9.2-p290 - RUBY EXECUTABLE: /usr/bin/ruby1.8 - EXECUTABLE DIRECTORY: /home/nick/.rvm/gems/ruby-1.9.2-p290/bin and when I run Rails, if I do puts RUBY_VERSION it outputs 1.8.7 . In fact, in irb , RUBY_VERSION gives 1.9.2 but in rails console it gives 1.8.7 . The main problem is that it's failing when it gets to my JSON-style hash-literals. I've tried various approaches of uninstalling rvm, rails, bundler, etc. but nothing seems to work. Any ideas? EDIT: Here is the output of rvm info : ruby-1.9.2-p290: system: uname: "Linux ubie 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 i386 GNU/Linux" bash: "/bin/bash => GNU bash, version 4.2.10(1)-release (i686-pc-linux-gnu)" zsh: " => not installed" rvm: version: "rvm 1.8.6 by Wayne E. Seguin (wayneeseguin@gmail.com) [https://rvm.beginrescueend.com/]" ruby: interpreter: "ruby" version: "1.9.2p290"

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