I have an application I'm making with the Web AppBuilder, and I got the analysis widget working once, but it hasn't worked since. It loads up and is then just blank. I'm using layers from an ArcGIS Online map, and the layers are coming from a REST service. I've tried turning many different layers on, and making sure I have the right permissions, but nothing seems to make any difference. Has anyone else had this issue, or any ideas how to solve it?