I'm attempting to use msxml:node-set() to transform result tree fragment to a node-set. If I feed the function an actual node-set (which is completely redundat, I know) then all is well, but when I feed it an RTF, the site stalls completely, an will eventually crash the app pool.

Where can I find debugging/loggin information to determine what is wrong? Or does the problem sound familiar to anyone?

I'll attach a snippet of code for reference, but I'll be happy to plow through error logs myself, if anyone can point me in the right direction.

    <!--Only show categories that have both a title and associated publications in the current language-->
    <xsl:variable name="unsorted-categories" select="Category[normalize-space(*[name() = concat('title', $lang_upcase)])][count(key(concat($lang_code, '-publications-by-category'), @id)) &gt; 0]"/>
    <xsl:variable name="sorted-categories">
      <xsl:for-each select="$unsorted-categories">
        <xsl:sort select="*[name() = concat('title', $lang_upcase)]"/>
        <xsl:copy-of select="."/>
      </xsl:for-each>
    </xsl:variable>
    <xsl:variable name="categories" select="msxml:node-set($sorted-categories)"/>
    <ul>
       <xsl:apply-templates select="$categories"/>
    </ul>

[msxml:node-set($sorted-categories) will crash, but msxml:node-set($unsorted-categories) will work.]