Turn off a theme or prompt suggestion and have it stay off
Your saved preferences hold after a page reload, and sign-ups, credit refills and sign-in requests stop failing on conflicts they should have shrugged off.
You switch off a prompt suggestion or pick a theme, reload the page, and find your old choice back again. That, along with a few account-level requests that failed for no reason you could see, is what changed here.
Settings that stick
Saving the same preference twice could leave two conflicting values behind, and Chief would read whichever one it happened to see first. A theme or prompt-suggestion choice you turned off came back on the next page load. Your setting now resolves to one value, so what you chose is what you get after a reload.
Credit refills and sign-ups
Daily credit refills, sign-ups and credit debits could fail when two writes landed at the same moment, and a refill would be skipped without any sign of it. Chief now retries those writes, so your credits arrive and your sign-up completes.
Sign-in requests
A request carrying a malformed sign-in credential used to come back as a server error, or in one case drop the connection outright. Chief now answers with a plain rejection, and a credential sent without the expected prefix no longer gets through.
Nothing to turn on. Set your theme and prompt suggestions the way you want them, and they will be there when you come back.