Also found a small bug in cart_reminder_cron.php, line 33.
Code:
$sql ="SELECT configuration_value FROM ".DB_PREFIX ." configuration WHERE configuration_key = 'CART_REMINDER'";
should be
Code:
$sql ="SELECT configuration_value FROM ".DB_PREFIX ."configuration WHERE configuration_key = 'CART_REMINDER'";
(I removed a space after ".DB_PREFIX .")
This script also needs the DB_PREFIX added to each statement.