Issues setting up grafana with ntopng

I am following the README.grafana file and the "Save & Test" in grafana
says the datasource is working but I don't get the expected results when
trying to create a new timeseries graph.

I have ntopng listening on port 4000 instead of 3000

/usr/local/bin/ntopng --version
v.3.1.170626 [Enterprise/Professional Edition]
GIT rev:   dev:be64fc68655d921d8baebc083bd151a90721a1ed:20170626
Pro rev:   r1107

The setup guide says my datasource URL should be :4000/lua/modules/grafana/
but I get a "Page "/lua/modules/grafana" was not found" when trying to
reach that URL. If I add a trailing slash I get a "{"status":"OK"}"
message.

Regardless, neither of these URLs seems to give me the expected result as
per the slides regarding grafana starting to autofill based on typing
"interface". I just see a lot of random letters/characters in which I've
attached a picture.

I am running Grafana 4.3.2( commit: ed4d170)

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