I tried to install WooSidebar and when it activates, I got a blank screen. I then deleted the plug-in so it disables itself. That got the site back but now when I try to install ANY plug-in, I get a "The plugin does not have a valid header."
Also, now I cannot even UPDATE an existing plug-in. It keeps saying "Update successful" but then when you view the update page, it continues to display it needs updated.
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