Update:
My device dashboards are back to normal. All gauges and line-charts back to values.
The line-chart problem in previous post seems to be restricted to projects with multi-line graphs. ???
The REST API issue persists. I notice that the new access-token and refresh tokens are both about 1400 bytes long, whereas the old access token for my account was about 600 and the refresh token was about 50 I think. So lots of parameters added, and some problem with the signature.
I think 1mo, 3mo, 6mo graphs have been implemented, but they don’t start with a full compliment of data, rather just the most recent week in a 1 month graph. That might be a feature not a bug … to cut down on excessive data demands.