Selecting data on a graph is not reliable about sanddance

[danmarshall]

Thanks for the report. Perhaps we can modify the timeout value to differentiate between a click and a drag.
The purple highlight is a cursor (not a selection) to show the active item in the data browser pane, where you can use prev/next buttons to peruse data items. We're trying to balance functionality vs simplicity of the ui, so hopefully some features are discoveries if they're not immediately intuitive.

I've fixed the final issue you mentioned in #681 which should be fixed in your html pages since uses the Unpkg cdn.