I confirm.
I also disabled the plugin “advanced featured post WIDGET” with the same result.
It should perhaps wait for an update of the plugin?
Why the plugin is causing this problem?
I recently upgraded wordpress 3.4.1 and now when I go to the widget page in
appearance, there is nothing!
So i can’t edit, update or delete the plugins that are on my site!
This has not happened before with an upgrade ??
