[SOLVED] Libnotify not displaying notifications when using Spork and Guard

Libnotify was working fine on my system (Lubuntu) until I started using guard-spork.

My Guardfile:

notification :libnotify

guard 'spork', :wait => 60, :rspec_env => { 'RAILS_ENV' => 'test' } do
  # ...
end

guard 'rspec', :version => 2, :all_after_pass => false, :cli => '--drb' do
  # ...
end

My Gemfile:

group :development, :test do
  gem 'rspec-rails'
end

group :test do
  gem 'rb-inotify'
  gem 'libnotify'
  gem 'spork'
  gem 'guard-spork'
  gem 'guard-rspec'
end

What could I be doing wrong here? I run bundle exec guard, spork is working fine, my tests are all passing, but the notifications are not showing up through libnotify. I'm using latest gems.