Using Helicon ISAPI_Rewrite 3 looses form POST data

Hi,

I have the MODx CMS system installed on IIS6 and am using ISAPI_Rewrite 3 to enable Search Engine Friendly URLs.

The code I have works nicely to rewrite /index.php?id=2 etc. to say /friendly-name.htm.  Issue comes with Form POST data going missing on the login and contact forms.  The forms work correctly when Friendly URLs are disabled.  

The ISAPI_Rewrite 3 logfiles show no errors.

I've asked for help on the MODx Forum but have had no response in 3 days.  The Live HTTP Headers AddOn for Firefox shows the data being posted when a form is submitted but the resulting web page does not see the data.

Can anyone advise what I can do to figure where the POST data is going to and how to ensure it survives the ISAPI_Rewrite Process?

My httpd.ini file is below.

Thanks,

Chris

RewriteEngine On
RewriteCompatibility2 On
RepeatLimit 32
RewriteBase

# ensure any POST data is available after url is rewritten
RewriteCond %{REQUEST_METHOD} !^POST$ [NC]


#  Block external access to the httpd.ini and httpd.parse.errors files
RewriteRule ^/httpd(?:\.ini|\.parse\.errors).*$ / [NC,F,O]
#  Block external access to the Helper ISAPI Extension
RewriteRule ^.*\.isrwhlp$ / [NC,F,O]

RewriteRule ^/(?!(?:manager|assets)/)(.*)\.html(?:\?(.*))?$ /index.php?q=$1?2&$2: [NC,L,U]

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