Just curious if anyone else has seen problems recently signing in to an organization using the Collector app? I've heard reports from more than one ArcGIS Online organization, and more than one OS; the users choose ArcGIS Online to sign into, but are rerouted to the login screen from what I understand, and never get "in". Nothing has changed as far as permissions or access within the organizations. I should have a chance to take a look first hand later in the week and will reply here if I have anything useful to add.
Uninstall and reinstall of the app itself took care of the problem in the case that I saw on iOS. Also saw a similar case on an older Blackberry, but haven't heard how it ended up. It seems like an update to the app coincided with the problem of the user accessing the organization.