I kept getting a blank screen too. Basically I commented out all of the modules and uncommented them back one by one. In the end, the calendar and newsfeed modules are not working and that’s what is giving me the black screen. I had to remove the following from the config file:

{
module: ‘calendar’,
header: ‘US Holidays’,
position: ‘top_left’,
config: {
calendars: [
{
symbol: 'calendar-check-o ',
url: ‘webcal://www.calendarlabs.com/templates/ical/US-Holidays.ics’
}
]
}
},

and

{
module: ‘newsfeed’,
position: ‘bottom_bar’,
config: {
feeds: [
{
title: “New York Times”,
url: “http://www.nytimes.com/services/xml/rss/nyt/HomePage.xml”
}
],
showSourceTitle: true,
showPublishDate: true
}
},

/* Magic Mirror Config Sample
*

• By Michael Teeuw http://michaelteeuw.nl
• MIT Licensed.
  */

var config = {
port: 8080,

language: 'en',
timeFormat: 24,
units: 'metric',

modules: [
	{
		module: 'alert',
	},
	{
		module: 'clock',
		position: 'top_left'
	},
	{
		module: 'calendar',
		header: 'US Holidays',
		position: 'top_left',
		config: {
			calendars: [
				{
					symbol: 'calendar-check-o ',
					url: 'webcal://www.calendarlabs.com/templates/ical/US-Holidays.ics'
				}
			]
		}
	},
	{
		module: 'compliments',
		position: 'lower_third'
	},
	{
		module: 'currentweather',
		position: 'top_right',
		config: {
			location: 'New York',
			locationID: '',  //ID from http://www.openweathermap.org
			appid: 'YOUR_OPENWEATHER_API_KEY'
		}
	},
	{
		module: 'weatherforecast',
		position: 'top_right',
		header: 'Weather Forecast',
		config: {
            location: 'New York',
			locationID: '5128581',  //ID from http://www.openweathermap.org
            appid: 'YOUR_OPENWEATHER_API_KEY'
		}
	},
	{
		module: 'newsfeed',
		position: 'bottom_bar',
		config: {
			feeds: [
				{
					title: "New York Times",
					url: "http://www.nytimes.com/services/xml/rss/nyt/HomePage.xml"
				}
			],
			showSourceTitle: true,
			showPublishDate: true
		}
	},
]

};

/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== ‘undefined’) {module.exports = config;}

If it has, copy it in here using the markdown features and we’ll take a look at it.