It's user specific. Now one of two household accounts can log in, but the other one still can't.

So, some users can get in, others can't. Seemingly random (or may be alphabetic). They probably lost/corrupted user data/database, and are only restoring it bit by bit.

(sarcasm on)
With (in)competence this high, it's a wonder LH planes are not falling out of the sky.
(/sarcasm off)