[support] big problem with drupal 7.19 on shared server

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