Plugin 11936 does not always produce results

Hello,

I am using Nessus (Nessus 2.2.10 for Linux) to take advantage of the Plugin 11936 in order to identify the OS of the systems that are being scanned.  I am running Nessus from the command line and outputting the results in an XML file.  However I find that not all systems produce OS results for this Plugin.  

Here is a sample of the results where the plugin worked.  There are 2 relevant sections to a file where the 11936 Plugin has produced results:

<plugin id="11936">
                        <name>OS Identification</name>
                        <version>$Revision: 1.155 $</version>
                        <family>General</family>
                        <cve_id>NOCVE</cve_id>
                        <bugtraq_id>NOBID</bugtraq_id>
                        <category>infos</category>
                        <risk>Unknown</risk>
                        <summary>Determines the remote operating system</summary>
                        <copyright>This script is Copyright (C) 2003 - 2007 Tenable Network Security</copyright>
                </plugin>

AND

 <id>11936</id>
                                <data>


                                                        Remote operating system : Windows Server 2003 3790 Service Pack 2
                                                        Confidence Level : 99
                                                        Method : MSRPC


                                                        The remote host is running Windows Server 2003 3790 Service Pack 2

                                </data>

**********************************************************************

However for machines where the plugin cannot detect the OS, I only get the first part, like this:

<plugin id="11936">
                        <name>OS Identification</name>
                        <version>$Revision: 1.155 $</version>
                        <family>General</family>
                        <cve_id>NOCVE</cve_id>
                        <bugtraq_id>NOBID</bugtraq_id>
                        <category>infos</category>
                        <risk>Unknown</risk>
                        <summary>Determines the remote operating system</summary>
                        <copyright>This script is Copyright (C) 2003 - 2007 Tenable Network Security</copyright>
                </plugin>

i.e. there is no section with the guessed OS being reported.

Is there a reason for this?  Please let me know if you require any information about the Nessus configuration in order to assist.

Thank You so much.

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