I have this same problem as here phpMyAdmin reports 'No Privileges'
However mine doesn't seem to be a cache issue, I've tested it on several browsers, uninstalled and re installed EasyPHP no luck.
I keep seeing a possible solution as
GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost';
FLUSH PRIVILEGES;
However I have no idea where to insert this line. If someone can give me a step by step guide, this will be very much appreciated!