I’ve a problem with Magento 1.7.0.2 (upgraded from 1.7.0.1 fresh install) :

1. When a customer register, he cannot login anymore. Everytime the
customer tries to login, he login page reloads.
2. When I try to edit a customer from the admin panel, I get the following error:

```
 Fatal error: Call to a member function setDisabled() on a non-object in /home/***/www/app/code/core/Mage/Adminhtml/Block/Customer/Edit/Tab/Account.php on line 83

```
3. When I try to add a new customer from the admin panel, I get the
 following error:

```
 Fatal error:  Call to a member function addClass() on a non-object in /home/***/www/app/code/core/Mage/Adminhtml/Block/Customer/Edit/Tab/Account.php on line 87

```

I have seen already some forums messages about this, and tried multiples proposed solutions, but none of them is working.

It’s really urgent for me to solve this issue, because if we cannot edit customers, of if customers cannot login, I can forget to launch my ecommerce website using Magento. It won’t work as expected…