The issues yesterday evening have now been fixed.
Android users: please update to version 1.6.2
Please leave us a comment below if you have any ongoing issues, or contact Customer Service at email@example.com
These were a result of updates to some security settings. We are looking into why these changes affected customers as they did, and we will be able to give you more details later today after our investigation.
If you are using iOS / Apple: There was a brief period when you were unable to log in, but this was resolved in the afternoon and you should have been able to log in again. Please let us know if this is still affecting you.
If you are using Android: ALL customers on Android need to update to the very latest version (1.6.2). It includes a security update so without it you will not be able to log in.
In the case of Android, the fix required some changes to the app itself, so whatever version you currently have installed, and whatever your specific device, you will need to make sure you go to the Google Play store to download the update