I was working OK with my dA account set to old site up until 4 Jan 2020. Then my account suddenly locked out for 48 hours, and support says I am sending "invalid session cookies." Now JDownloader can't log into dA any more (plugin outdated) and I get the same mature content blocked png file as above.

Consider this another vote for updating this plugin. I have donated before, will donate again if this is fixed.