Thanks for the feedback.
I've recently installed Waze on my old/spare Lumia 920. That too has the same forgotten ID problem as seen on the Lumia 930.
It has only started doing it within the last few weeks. Has Waze changed something (server side?) within this timespan?
I too support the desperate pleas to bring back WP support for Waze. I'm not going to change my phone to Android or Crapple just to get support for my preferred satnav app - I'd rather keep Waze, but will ultimately search for an alternative app.