Here we go...
You can use the edit file menu option under diagnostics. Load each of the following and replace all the text (copy/paste) with the correct attached file. Make sure to click save.
/usr/local/pkg/miniupnpd.inc gets replaced with miniupnpd.inc.txt
/usr/local/pkg/miniupnpd.xml gets replaced with miniupnpd.xml.txt
/usr/local/www/status_upnp.php gets replaced with status_upnp.php.txt
Afterwards goto the minupnpd settings page, make sure the correct interface is selected, most likely lan, and click change. This will recreate the config section and restart miniupnpd. Enjoy!
If you would rather just reflash you can download my compilation of 1.0-RELEASE with the package added here.http://wgnrs.dynalias.com:81/pfsense/pfSense-Embedded-1.0-RELEASE-Miniupnpd.img.gz
Note: The unknown soap method in the system log is still present. I did not change the binary only the package configuration files. You can just ignore the above in the system log. It appears to be from windows systems and the internet connection (internet gateway) in the network connections. Windows trys to enable this which is unsupported by miniupnp.