Urgent: Issues with live site not present on test site

[babyewok]

My site is running just fine on my test server on my local computer, but on hte live site, I cannot acces the Order deatils page in the back off ice - it is blank, and on the front office, checkput is fine until I get to the payment selection page.

How I transfered the site fomr test to live:
I copied all folders and files over to the live server
Created a database backup file from the test server
Created a new database on the live server and imported the backup file
Updated the settings file to reflect the new database settings.

Where did it all go wrong? I have tried making a new backup file and re-importing it, but the issue remains. Why would it all work fine on my test server, but not live?

Help!

[Yann - Prestaplugins]

Did you activate the display of errors in config.inc.php ?
Maybe you will see something.

@ini_set('display_errors', 'off');
define('_PS_DEBUG_SQL_', false);

change to

@ini_set('display_errors', 'on');
define('_PS_DEBUG_SQL_', true);

[babyewok]

Thanks for you reply. I did try that but got no errors. It turned out to be one of my payment modules atht needed deleteing and reinstalling.