This plugin does not respect the $table_prefix setting in wp-config.php. Instead, it creates a table with the invariant name ahm_files.
As a result, you’ll get this:
* Two WP sites using the same MySQL database will get each other’s data
* All sites within a WPMU install will get the same data
* Backup tools won’t recognise this plugin’s data as belonging to WordPress, and hence won’t back it up.
It seems that others have already hit these problems:
http://wordpress.org/support/topic/file-not-found-after-server-change?replies=1
http://wordpress.org/support/topic/packages-showing-on-all-sites-in-network-install?replies=1
This is a very serious problem and ought to be fixed as soon as possible.
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