Upload media file problem

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I’d suggest asking your client what value is shown when adding media, as shown here in the screenshot.

enter image description here

If the value shown is 1mb then i can tell you the function responsible is the following.

function wp_max_upload_size() {
    $u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
    $p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );
    $bytes = apply_filters( 'upload_size_limit', min($u_bytes, $p_bytes), $u_bytes, $p_bytes );
    return $bytes;
}

Found in wp-admin/includes/template.php
http://core.trac.wordpress.org/browser/tags/3.0.4/wp-admin/includes/template.php#L2712

As you can see from the above function, the value is first determined by the server ini configuration and secondly by any filters hooked onto upload_size_limit. If the server configuration is not matching what you see displayed, then my guess would be a plugin/theme adding a filter onto upload_size_limit which is imposing a different file size limit.

Additional
Some support topics that mention a similar problem.
http://wordpress.org/support/topic/upload-limit-problems-on-local-site
http://wordpress.org/support/topic/multiple-domain-mod-limits-file-uploads-to-1mb
http://wordpress.org/support/topic/max-upload-size-problem-yes-again

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