Create Drive-Time Areas Measures dropdown in 11.0

[RobStauder]

Any thoughts about what's going on here?

ArcGIS Enterprise 11.0, Utility services pointing to ArcGIS Online

1. Open map viewer classic
2. Add a point through either map notes or a feature layer
3. Analysis > Proximity > Create Drive Time Areas
   1. Most of the time, the Measure dropdown does not populate. It looks like this:
4. If I open dev tools, I see a few errors on the console. Like this - 

   https://foo.thing.com/arcgis/sharing/servers/ff44a2ea21a34a4ba37934010a2f67ed/rest/services/World/Utilities/GPServer/GetToolInfo/execute?f=json&toolName=GenerateServiceAreas&serviceName=asyncServiceArea&token=…. with these errors - Failed to load resource: the server responded with a status of 400 (Bad Request) and[USO] Button detection aborting due to timeout.

5. However, if I fiddle with the widget, perhaps close it and reopen it a few times, the measure dropdown will work! 
6. However, when I run the tool, sometimes it works, sometimes it fails with You do not have permissions to access the utility routingUtilities. Create Drive Time Areas failed. 

Am I missing a service timeout setting somewhere? What could be happening?

Thanks!

Rob