It vanishes suddenly without any notifications today. I am using Drupal 7 with "Mix and Match" theme. I used to working this morning.
Website shows no error at all.
I have tried the following to get it back:
Find the block table in the database and tried to modify the visibility of the user, login of current theme entry - not working
At admin->structure->blocks, under the current theme. The "User login" is already under sidebar first. I tried remove it and add back, changing the weight - not working
In the other themes the user login block does not show up either, including the default theme Bartik.
Repeat the above steps with a
drush cc allcommand. Not working.
What else could I try to get it back?