After a server reboot, a Drupal site suddenly was behaving odd:
1) The theme was reverted back to the default "garland" theme.
2) I was unable to login: A valid login simply returned me to the same login page as if nothing happened.
Wrong username/password combinations however, gave an error message.
Weird...
I've checked apache/htaccess, but everything was fine - even the rewrite rules.
[SOLUTION]
The tables "session" and "variable" in the MySQL database was marked as "in use" - and unable to be browsed or accessed.
So I've used "PhpMyAdmin" to repair that table - as explained in a HowTo on hostingformular.net.
PhpMyAdmin showed a warning vor the "variable" table, but still I was able to login now:
After logging in, I had to re-set the timezone and re-assign the default theme - and then everything was back to normal!Table Op Msg_type Msg_text
variable repair warning Number of rows changed from 165 to 164
