Undefined PHP Script core

Hi,
After I successfully installed Minthcm 3.1.3, there some issues I wanted to point out:

1.- Some of the Options, it shows undefined options.
2.- The dashlets to see emails in the dashboard, even allowing the access to those users, the user cannot access to dashlets options to enable email module at Dashboard.
3.- Only main Administrator account is allowed to see those emails from dashboard, but when I try to reply them, it shows an error undefined.
4.- I have tried to repair the whole core and repair permission, but none of what I tried to succeed.

I want if you guys can have a look and give me some advice, on how to fix this core, as it will be extremely painful to re-install the whole core, due I have more users, they are using this access to provide work in a daily basis.