I'm using CentOS 6 and the latest phpMyAdmin (4.0.1.4) and I noticed the error "The mcrypt extension is missing. Please check your PHP configuration."
I went ahead and ran:
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
then ran:
yum install php-mycrypt
Then restarted httpd services and still no luck.
Any idea how I can get it to go away?