http://docs.layerswp.com/doc/troubleshooting-customizer-errors/
Seriously. Inactive widgets slowed my customizer down so much I couldn’t use it.
I had basically played around with themes and all the widget options stayed. I also had a very weird layout when I went to clear inactive widgets, but it went back to normal.
Anyway. To the widget-mobile to try and get instagram to display 🙂