I have an API key, and tried to use it, but wordpress has somehow become tangled up with a new one I tried to make, and the old on Metallus established when he set up Nightlight:
Error from last API Key attempt:
The owner of that API Key (nightlightprod) is not on the access list for this blog (8825346). When this blog was registered, nightlightprod's API key was used. To add you to the access list, nightlightprod must visit this blog's stats dashboard page and use the form at the bottom of that page.
I've got the login details for two API keys now, but it's not letting me put in either of them.
I actually backed up nightlight, deleted wordpress, put on a new version and imported the backup... and it still didn't work either. Something was maybe still hanging around in the backup?