Troubleshooting a black canvas in SAP Dashboards

You install an add-on and the canvas is black. Now what?
https://youtube.com/watch?v=ZGIZ_mPi-uo%3Fversion%3D3%26f%3Duser_uploads%26d%3DAT2ca1kQxTtL70xxV7Hkg_QO88HsQjpE1a8d1GxQnGDm%26app%3Dyoutube_gdata
Visit: http://www.youtube.com/watch?v=ZGIZ_mPi-uo&feature=youtube_gdata_player