This is very obvious in retrospect: the reason my WordPress to Dreamwidth crossposting stopped working is because Dreamwidth made security changes and as a result you don’t get to use your password for the API any more. Good change! If you cluelessly don’t pay attention, though, your WordPress plugin will stop working.
Solution: go to the Mobile Post Settings page and generate yourself a new API key. Easy.
This is a very light excuse for a weekly post but man, this week was kind of disfocused for various reasons.