Have been looking around for a solution to this, to no avail. We purchased a Bing Maps license key in January to continue using the service, but starting 5-7-2014 (two days ago) the layer has been broken. There is a red exclamation mark on the layer which usually points towards the layer's source not existing. I'm not sure why this error is occurring, and I can't do anything to fix it. The error isn't unique to just the Bing Maps Aerial layer, but to any layer sourced from Bing. Any insight at all on this problem?