HI, After uploading a new plugin I got an error message and all plugin;s were removed in the admin view. Error message told me something about a missing header or something...
I tried disabling plugins one-by-one to see if I could isolate one that
was causing a problem--no luck.
I tried replacing your core WP files--also with no luck.
Permissions seem to be fine as well.
Do you have any idea how to solve this matter ?