Symptoms
You get a blank screen when you login to the Administrative interface.
There is no response when you click the tabs in the Administrative interface.

Cause
You need to have javascript enabled for the Administrative Interface to work correctly.

Solution
If you are using Internet Explorer, please check the following:

Open Internet Explorer and select Tools - Internet Options
Click the Security tab
If the Security level is set to High, move the security level slider to Medium
If the Security level is set to Custom, click the "Custom Level..." button and set "Active Scripting" to Enable.

If you are using Internet Explorer version 6, you need to update to a current version.

If you are using Firefox, check the following:

Open Firefox and select Tools - Options
Click on Web Features
Check "Enable Javascript"