My niece said she suddenly got this prompt for a username and password. It won't allow her to go any further but she doesn't know what to put in the boxes. Has anyone seen this? This doesn't appear to have anything to do with the wifi password which was connected and working fine in the past.
Try 'pi' and 'piper' and if that doesn't work try 'pi' and 'raspberry'.
What was she doing before she got that?