Update didn't change anything

As expected, updating to 2.4.6 didn't solve anything. Bad behaviour, Stop Forum Spam and all other possible measures are of course enabled. Close to 300 fake users have been sending out spam from my address the last 24 hours (after the update). Registering users manually is not an option.

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Hundreds of fake user registrations each day - Brent, 2017-12-12, 07:44
- Hundreds of fake user registrations each day - Micha, 2017-12-12, 08:06
  - Hundreds of fake user registrations each day - Brent, 2017-12-12, 08:18
    - Hundreds of fake user registrations each day - Brent, 2017-12-12, 08:22
    - Hundreds of fake user registrations each day - Micha, 2017-12-12, 08:27
      - strongly recommended update, amendment - Auge, 2017-12-12, 08:55
        
        strongly recommended update, amendment - Micha, 2017-12-12, 09:00
        
        Update didn't change anything - Brent, 2017-12-13, 14:21
        
        Update didn't change anything - Auge, 2017-12-13, 15:20
        
        Update didn't change anything - Micha, 2017-12-13, 15:53
- Hundreds of fake user registrations each day - Auge, 2017-12-12, 08:49

my little forum

Update didn't change anything (General)