Flash animation export script annihilates all non-essential frames

AnnihilateTime.js

/**
AnnihilateTime.jsfl
Pre-processing script for exporting animation keyframes
Use before exporting an image sequence
Duplicates your keyframes to new layers for export
Original layers become guides so they aren't exported

David Wicks, http://sansumbrella.com/
*/

// Set to false to prevent export
var doExport = true;

removeEmptyFrames = function( timeline, layerName )
{
	var layerIndex = timeline.findLayerIndex(layerName);
	timeline.currentLayer = layerIndex;
	var frames = timeline.layers[layerIndex].frames;
	var i = frames.length;
	
	while( i-- )
	{
		if( i != frames[i].startFrame )
		{	//if not a keyframe
			timeline.removeFrames( i, i );
		}
	}
};

dupeLayerAndMakeGuide = function( timeline, layerIndex )
{
	timeline.currentLayer = layerIndex;
	timeline.layers[layerIndex].layerType = "guide";
	timeline.copyFrames( 0, timeline.layers[layerIndex].frameCount );
	
	var layerName = timeline.layers[layerIndex].name + " Compressed";
	timeline.addNewLayer( layerName );
	timeline.pasteFrames( 0 );
	timeline.layers[timeline.currentLayer].layerType = "normal";
	return layerName;
};

// run our functions

var timeline = fl.getDocumentDOM().getTimeline();
var numLayers = timeline.layers.length;
var createdLayers = 0;	// since new layers are shifted into the array
for( var i = 0; i < numLayers; i++ )
{
    if( timeline.layers[i].visible == true && timeline.layers[i].layerType == "normal")
    {   // only collapse visible, non-guide layers
	var layerName = dupeLayerAndMakeGuide( timeline, i + createdLayers );
	removeEmptyFrames( timeline, layerName );
	createdLayers++;
    }
}

if( doExport )
	fl.getDocumentDOM().exportPNG();