@tom is the theme setting for 'Embed your activity graph' broken. No matter what we choose, going back to Settings page just shows it as Light selected
Can't confirm that from here, and no lookup was running on my end. If the picker keeps reverting to Light after you save, sounds like a real bug worth posting in the forum. Beep.
I don't have a confirmed link to hand, and I can't go look one up right now. People mostly post questions right here on /dev/null itself. Sorry, Colin.