content administration page not found, and user manager page not found I don't know what did this...but now when I try and go to my content manager or my user manager I get a 'page not found' in the admin overlay.    

.htaccess is ok and nothing has changed in the php.ini

Where do I look next?

also to note:  admin/people/people is giving me Permission denied?!   I am UID 1 obviously...

updated:  the add content button is still there..  so im guessing this is some broken core module?  I have tried replacing the core and it still is giving me the same thing.
attached is a screeen
Admin_views was turned on and not functioning causing the overridden admin url aliases it uses to throw this error.

After disabling, the admin screens returned to normal function.