The errors below most likely are caused by the PHP5.3, you might get something like below if you upgrade to PHP5.3 Deprecated: Function session_unregister() is deprecated in /modules/Users/Authenticate.php on line 70 Deprecated: Function session_unregister() is deprecated in /modules/Users/Authenticate.php on line 71 Deprecated: Function session_unregister() is deprecated in /modules/Users/Authenticate.php on line 72 In order to fix it, you will need to replace lines 70,71,72 from: session_unregister(‘login_password’); session_unregister(‘login_error’); session_unregister(‘login_user_name’); To: unset($_SESSION[‘login_password’]); unset($_SESSION[‘login_error’]); unset($_SESSION[‘login_user_name’]);

The errors below most likely are caused by the PHP5.3, you might get something like below if you upgrade to PHP5.3 Deprecated: Assigning the return value of new by reference is deprecated in /adodb/adodb-xmlschema.inc.php on line 373 Deprecated: Assigning the return value of new by reference is deprecated in /adodb/adodb-xmlschema.inc.php on line 385 Add ini_set(‘display_errors’,0); error_reporting(0); to index.php in vtigercrm root directory. This will suppress the errors. Go to the lines 373, 385 and replace “=&” with “=” (removed &). It should fix the errors.