Fresh install (i.e. remove container, image and appdata folder) on both. The repository/hub fields for each:
roninkenji/dropbox-docker
https://hub.docker.com/r/roninkenji/dropbox-docker/
and
otherguy/dropbox
https://hub.docker.com/r/otherguy/dropbox
Each time: I install, check the logs, it asks me to click a link to authenticate, I do so, it begins spamming the aforementioned alert and nothing ever syncs.