I am using WordPress version 3.4.2
I installed WordPress SEO by Yoast 18.104.22.168 on 23/10/2012
I am having exactly the same error and can not access any area of the Admin area or Dashboard. I tried to delete the Plugin via the File Mangaer area in httpdocs/wp-content/plugins/wordpress-seo but I get another error message: Error:unable to remove file /httpdocs/wp-content/plugins//var/www/vhosts/central.nviron-plesk.manc.iws-hosting.co.uk//httpdocs/wp-content/plugins/wordpress-seo: filemng: Error occured druing /bin/rm command
I also get a pop-up box open: Help Improve WordPress SEO. You've just installed WordPress SEO by Yoast. Please helps us improve it by allowing us to gather anonymous usage stats so we know which configurations, plugins and themes to test with. I can not select either option 'Allow Tracking' or 'Do Not Allow Tracking' and my site is now in limbo as I can't do anything with it.