My gruntfile.js:
'use strict';
module.exports = function(grunt) {
    
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        watch: {
            jade: {
                files: ['app/views/**'],
                options: {
                    livereload: true,
                },
            },
            js: {
                files: ['gruntfile.js', 'server.js', 'app/**/*.js', 'public/js/**', 'test/**/*.js'],
                tasks: ['jshint'],
                options: {
                    livereload: true,
                },
            },
            html: {
                files: ['public/views/**'],
                options: {
                    livereload: true,
                },
            },
            css: {
                files: ['public/css/**'],
                options: {
                    livereload: true
                }
            }
        },
        jshint: {
            all: {
                src: ['gruntfile.js', 'server.js', 'app/**/*.js', 'public/js/**', 'test/**/*.js'],
                options: {
                    jshintrc: true
                }
            }
        },
        nodemon: {
            dev: {
                options: {
                    file: 'server.js',
                    args: [],
                    ignoredFiles: ['public/**'],
                    watchedExtensions: ['js'],
                    nodeArgs: ['--debug'],
                    delayTime: 1,
                    env: {
                        PORT: 3000
                    },
                    cwd: __dirname
                }
            }
        },
        concurrent: {
            tasks: ['nodemon', 'watch'],
            options: {
                logConcurrentOutput: true
            }
        },
        mochaTest: {
            options: {
                reporter: 'spec',
                require: 'server.js'
            },
            src: ['test/mocha/**/*.js']
        },
        env: {
            test: {
                NODE_ENV: 'test'
            }
        },
        karma: {
            unit: {
                configFile: 'test/karma/karma.conf.js'
            }
        }
    });
    
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-jshint');
    grunt.loadNpmTasks('grunt-mocha-test');
    grunt.loadNpmTasks('grunt-karma');
    grunt.loadNpmTasks('grunt-nodemon');
    grunt.loadNpmTasks('grunt-concurrent');
    grunt.loadNpmTasks('grunt-env');
    
    grunt.option('force', true);
    
    grunt.registerTask('default', ['jshint', 'concurrent']);
    
    grunt.registerTask('test', ['env:test', 'mochaTest', 'karma:unit']);
};
and when I type grunt, I get:
$ grunt
Running "jshint:all" (jshint) task
>> 69 files lint free.
Running "concurrent:tasks" (concurrent) task
Running "nodemon:dev" (nodemon) task
Running "watch" task
Waiting...
Usually he speaks Express started on Port 3000, but suddenly this is not so. Not sure what is going on. Any ideas?
When launched with the flag, -vI get:
Running tasks: nodemon
    Running "nodemon" task
    Running "nodemon:dev" (nodemon) task
    Verifying property nodemon.dev exists in config...OK
    File: [no files]
    Options: file="server.js", args=[], ignoredFiles=["public/**"], watchedExtensions=["js"], nodeArgs=["--debug"], delayTime=1, env={"PORT":3000}, cwd="/Users/shamoon/Sites/blocksearcher"
    Loading "env.js" tasks...OK
    + env
    Loading "gruntfile.js" tasks...OK
    + default, test
    Running tasks: watch
    Running "watch" task
    Waiting...Verifying property watch exists in config...OK
    Verifying property watch.jade.files exists in config...OK
    Verifying property watch.js.files exists in config...OK
    Verifying property watch.html.files exists in config...OK
    Verifying property watch.css.files exists in config...OK
    Live reload server started on port: 35729
        Watching app/views for changes.
    Watching app/views/includes for changes.
    ...