The user was authenticating with firefox and this plugin: https://addons.mozilla.org/en-US/firefox/addon/750 Desactivating the plugin solved the problem.
Hoping that will be useful, if someone already experienced a similar case, Arnaud. On Oct 22, 10:58 pm, Arnaud Meunier <arnaud.meun...@twitoaster.com> wrote: > Hi, > > One of my members cannot connect with a specific account, where other > accounts work. The account is not suspended. Every login try ends with > a "OK, you've denied *Twitoaster* access to interact with your > account!". > > Account name is "@msbookish". Anyone would have experienced that kind > of problem? Is there some kind of bug with this specific account? > > All the best, > Arnaud.