I agree with the screaming.
I have re-checked my different wp_options tables.
The only odd thing now is a row called “group_options” inside the main options and th main blogs wp_options_table. The value for this is set to:
a:1:{s:7:"general";a:1:{s:22:"read_post_capabilities";a:1:{i:0;s:16:"groups_read_post";}}}
And that really tells me nothing, except that this might be a surviving element from the “groups” plugin which I unfortunately installed long ago. It left traces everywhere.
In the wp_options are “default_role” set to “subscriber”.
“reguire_name_email”, “comment_moderation” and “moderation_notify” and “moderation_keys” have all blank values, while “comment_registration” is set to “1”, i.e.: All logged-in and registered blog owners are supposed to comment without moderation.
All the other rows in the different wp_options tables are pure and clean. So it simply cannot be there.