The document upload of the subject plugin fails if the WordPress Firewall 2 plugin is installed in its default configuration. This is because the upload process specifies "&action=wp_handle_upload", which is detected as a "WordPress-specific SQL Injection attack".
You can work around the problem by whitelisting the "action" variable, or your source IP address, or by turning off the check for this specific kind of attack.
I have also reported this problem to the author of the Minutes, Agendas and Newsletters plugin.
