can't get the get_post_meta values

Hi,

I have a irritating problem ??
The thing is that I’ve created a metabox.
The meta box contains different fields which save the data to the database like it should.

However I can’t get them out of the database.

This is what I do:

<?php
$custom_text = get_post_meta($post->ID, 'custom_text', true);  echo $custom_text;
?>

The database holds a field called custom_text and is in the wp_postmeta.
One additional note: I have changed the prefix of the database.
I don’t think it will matter (because it never did)

Can someone please give me some pointers on common mistakes.
or maybe a sollution.

M.