isDebugSWF = new Error().getStackTrace().search(/:[0-9]+]$/m) > -1;

can prevent your swf from loading in the release version of the Flash Player (not debug though). If you need to use it call it after the application has loaded and not in the constructor of your class.

The solution I use is the same but had the idea to directly use new Error() to always have access to getStackTrace without to have to use a try…catch.

I implement it in my own apps with :
public static const debug:Boolean = new Error().getStackTrace().search(/:[0-9]+]$/m) > -1;

package net.panellabs.utils
{
public final class ApplicationPath
{
public static var isLocal:Boolean;

public static function init(SWFPath:String):void //ApplicationPath.init(loaderInfo.url);
{
if(SWFPath.indexOf(“file:”) > -1)
{
isLocal = true;
}
else
{
isLocal = false;
}
}
}
}