I couldn't find what you were talking about.
I found this in mxcomment.php.
There are alot of "itemid" there. 
Should I try to comment something out?
foreach ( $rows as $row ) {
if ( $row->sectionid ) {
$bs = $mainframe->getBlogSectionCount();
$bc = $mainframe->getBlogCategoryCount();
$gbs = $mainframe->getGlobalBlogSectionCount();
$Itemid = $mainframe->getItemid( $row->id_content, 0, 0, $bs, $bc, $gbs );
} else {
$query = "SELECT id"
. "\n FROM #__menu"
. "\n WHERE type = 'content_typed'"
. "\n AND componentid = $row->id_content"
;
$database->setQuery( $query );
$Itemid = $database->loadResult();
}
// Blank itemid checker for SEF
if ($Itemid == NULL) {
$Itemid = '';
} else {
$Itemid = '&Itemid='. $Itemid;
}
$item = new FeedItem();
$item->title = htmlspecialchars( $row->titlearticle );
$item->title = html_entity_decode( $item->title );
$item->title = _MXC_RSS_COMMENTON . " " . $item->title . " (" . _MXC_RSS_WRITTENBY . " " . stripslashes( $row->name ) . ")";
$item->link = sefRelToAbs("index.php?option=com_content&task=view&id=$row->contentid$Itemid#maxcomment$row->id");
$item->description = ( $row->title!='' ) ? $row->title : $row->comment ;
$item->description = mosHTML::cleanText( $item->description );
$item->description = html_entity_decode( $item->description );
// limits description text to 10 words
$item_description_array = split( ' ', $item->description );
$count = count( $item_description_array );
if ( $count > 10 ){
$item->description = '';
for ( $a = 0; $a < $info[ 'text_length' ]; $a++ ) {
$item->description .= $item_description_array[$a]. ' ';
}
$item->description = trim( $item->description );
$item->description .= '...';
}
$item->description = stripslashes( $row->name ) . " > " . $item->description . " <a href='". sefRelToAbs("index.php?option=com_content&task=view&id=$row->contentid$Itemid#maxcomment$row->id")."'>" . _MXC_RSS_VIEWCOMMENT . "</a>";
$item->date = date( 'r', $row->created_ts );
$item->source = htmlspecialchars( $mosConfig_live_site );
$rss->addItem($item);
}
// save feed file
$rss->saveFeed('RSS2.0', $rssfile, 1);