Yes, I am doing some tests with 2.1.1. If you are not getting errors could it be that the data
is in the database and your query is not returning the correct time range?
Run a query that fetches everything from the measurement to see whether something has been written, and if so what. If there is already a lot of data there then test it with a new measurement to see what is going on.
Well something must be different or it would have worked then. The trouble with giving up and starting again, rather than working out what the problem is, is that if it happens again you will be back at square 1.