We have noticed that, some mysql installations does not allow us to connect as root.
So, we updated the installer http://ehcp.net/ehcp_yeni.tgz to overcome that (Ver 0.37.10.b).
Tha problem is described shortly at http://ubuntuforums.org/showthread.php?t=2275033&p=13272495#post13272495
If you live problem in adding mysql db's, in your existing ehcp installations, you need to run:
shell$ sudo mysql -u root