Forgot to place in code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet 
    version="1.0" 
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
    xmlns:msxml="urn:schemas-microsoft-com:xslt"
    xmlns:umbraco.library="urn:umbraco.library"
    xmlns:msxsl="urn:schemas-microsoft-com:xslt"
    xmlns:math="urn:schemas-hizi-nl:math"
    xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings"
    xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath"
    exclude-result-prefixes="msxml Exslt.ExsltMath Exslt.ExsltStrings math umbraco.library">


<xsl:output method="xml" omit-xml-declaration="yes"/>

<xsl:param name="currentPage"/>

<msxml:script language="JavaScript" implements-prefix="math">
function random(numDie,numMax,numMin){
if (numMin==null){numMin=1;}
var sum=0;
for (var index=0;index&lt;numDie;index++){ 
sum+=Math.floor(Math.random()*(numMax-numMin) + numMin);
}
return "" + sum;
}
function floorme(numFloor){
return "" + Math.floor(numFloor);
}
</msxml:script>

<xsl:template match="/">

<xsl:variable name="images" select="$currentPage/data[@alias='rotatingImages']"/>
<xsl:if test="$images != ''">
   <xsl:variable name="splitDocs" select="umbraco.library:Split($images, ',')" />
   <xsl:variable name="random" select="math:random(1, count($splitDocs/value)+1, 1)"/>
      <xsl:for-each select="$splitDocs/value">
      <xsl:if test="position()=$random"> 
         <xsl:if test=". != ''">
            <xsl:variable name="mediaNode" select="umbraco.library:GetMedia(.,0)"/>
            <xsl:if test="$mediaNode != ''">
                  <img src="{$mediaNode/data [@alias='umbracoFile']}" alt="{$mediaNode/@nodeName}"/>
           </xsl:if>
        </xsl:if>
      </xsl:if> 
      </xsl:for-each>
</xsl:if>

</xsl:template>

</xsl:stylesheet>

Did you reseed the database between environments?

Of course there might be changes to config files that could cause this. Any difference in the web.config or umbracosettings.config other than the database connection string and debugging settings?

We didn't reseed -- using Courier to publish media files.

No differences in config files other than connection strings.

Well, it looks like courier is just changing the media Id's then.. You should probably have a talk with Courier support about this!

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