Scene control broken?

In the last 2 days or so, all of my scenes fail to launch using the standard “Alexa, turn on ”. The response I get after the blinky-ring acknowledgement on the echo dot is "Sorry, doesn’t support that.

I’ve tried the normal routine of disable/forget devices/re-enable skill/discover devices.
I’ve tried updating firmware to latest on Vera (UI7).

Anything else I could try to make this fragile system work again until it breaks the next time?