Here is a strange bug : I have about 20 blogs / sites on my wp multisite install and since a few days (maybe the last update... I didn't check everything at this time...) :
- one blog send blank pages for all URL, login... (the server send a 404 message via firebug with a non existing URL but display a blank page too) : this is the installation blog, the first one, the current site in wp-config.php
- another one send correctly the front end but wp send a 404 page not found on all admin pages (/wp-admin/, /login...)
All other blogs are fine for everything !!!
Of course I tried to deactivate all plugins for those two blogs directly in the database as well as clear all the rewrite rules... but nothing changed !
Has somebody seen such a mess ? Or has any idea or solution to debug ?