IIS 7 2008 PHP uploads failing over ~8MB

I'm having problems uploading large files on this server with a php script. I'm sure I've done all the necessary changes to the PHP.ini file to allow larger uploads. I'm sure it is a file size error (compared to time out) as connecting directly to the server to run the script and uploading a 10MB file gives and instant failure. Smaller files are fine.

Relevant php.ini information is below as reported by doing a phpinfo() at the base of my script file.

Directive Local Value Master Value
file_uploads      On      On
max_execution_time 1200      60
max_file_uploads    20       20
memory_limit 256M 256M
max_input_time 1200 1200
post_max_size 256M 256M
upload_max_filesize 262144000 262144000      (yes this is in bytes)
upload_tmp_dir C:\Windows\Temp C:\Windows\Temp

Now all this is run on an IIS7 2008 server which I'm not much experienced with however like I said small files are all OK. I have flush /recycled the Application pool attached to the server and restarted the website server several times to ensure php.ini changes are picked up - and they are shown in the ini on the script page.

I did find some info on time-outs for the server and CGI in IIS7 and the fact it has a silent default of 30MB for file (a size I'm not even getting to). However I have also made the following changes/additions to the web.config.

              <requestLimits maxAllowedContentLength="2000000000" />
      <httpRuntime maxRequestLength="256000" executionTimeout="900" />

This should give ample time.

One other note which may be relevant .. I had problems with the web platform installation of PHP as it would not install PEAR so I removed and installed PHP as per these steps http://learn.iis.net/page.aspx/246/using-fastcgi-to-host-php-applications-on-iis-7/ and into a c:\php5 location so I could get pear running. I doubt this has much influence as like I said smaller uploads work fine.
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wait1Author Commented:
Ok this was a stupid mistake an incorrect value in the code was being read as the upload limit. 3 days I wont get back.

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