[support] big problem with drupal 7.19 on shared server

[Roger]

Hello
I updated drupal using drush successfully on the shared server

When trying to open permissions I got bytes exhausted error and had to 
increase memory_limit to 256M to at least access permissions.

Now have a problem, in /admin/structure/types/add I get error:
*Fatal error*: Allowed memory size of 134217728 bytes exhausted (tried 
to allocate 79 bytes)

I have tried various memory settings in php.ini on the server and find 
that memory_limit = 128M seems to try to allocate less bytes than if I use
  96M, 128M or 256M.

Why does drupal exhaust memory, this  seems most strange
Can you please tell me what causes this error and how to fix it. Google 
has not helped much.
Thanks in advance
Roger