Ruby on Rails

I'm trying to get the ruby debugger working and can't seem to get there.  Environment summary:

Mac OS X Lion
RVM
Ruby 1.9.3p125
Rails 3.2.3
Rspec 2.9.0

I've put the debugger statement in my controller like so:

  def show
    debugger
    seasons = Season.where(:name=>params[:id])
    puts @seasons
    @season = seasons.first
    puts @season
    @season_entries = @season.season_entries
  end

And run my spec like so:

$ bundle exec rspec -d spec/controllers/seasons_controller_spec.rb

Without the -d, my spec runs as I expect it - except the test fails for a reason I'm trying to figure out with the debugger. :)

With the -d, I get this error:

/Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/rspec-core-2.9.0/lib/rspec/core/configuration.rb:422:in `rescue in debug=':  (RuntimeError)
**************************************************
dlopen(/Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle, 9): Symbol not found: _ruby_current_thread
  Referenced from: /Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle
  Expected in: flat namespace
 in /Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle - /Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.bundle

If you have it installed as a ruby gem, then you need to either require
'rubygems' or configure the RUBYOPT environment variable with the value
'rubygems'.

/Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `require'
/Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>'
/Users/dpassage/.rvm/gems/ruby-1.9.3-p125/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `require'
[...]

Any ideas/advice?

-David

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