Hi. I am having this problem now too. I updated the web map and feature layers in early February, and all were working well. The web map is composed of two hosted feature layers, a polygon layer with six polygons and a point layer with six points - election districts and polling places. The polling place layer will not load in the web map and therefore is not available in the instant application in our public facing GIS gallery. In the web map, the point layer has the little blinking blue dot, which keeps on blinking. I suppose I will have to overwrite (republish) the layer, or is there something else I can try?