1st off, do you know how to enable story manager debugging? It will print a log file telling you if a quest was unable to start because of alias failures.
I find this extremely useful when debugging my scenes/quests. The value to turn this on is somewhere in the skyrim ini's. just look for the work 'story manager' or 'storymanager'

2nd) I have yet to get a 'force greet' package to work in a scene. I got really frustrated and gave up, especially when I found an easier way to do this:
create a 'blocking' branch in your quest's dialogue view. have the starting topic be what you want your actor to say as a 'force greet'. for blocking branches, the starting topic is used as a greeting.
http://www.creationkit.com/Dialogue_Branch

This way you just send the actor to it's hit marks, then start the quest with the blocking dialogue branch. They will speak the starting topic, and then conversation will continue from there, or you can start your scene from that dialogue branch if you really want to use a scene.

You have to be careful though, and make sure your blocking branch has strict conditions, because an NPC won't say any other dialogue if it has a valid blocking branch.

ALSO: check out this thread
http://www.gamesas.com/topic/1375526-using-forcegreet/page__hl__trigger

Well, save games include scripts, so your trigger script might not do what you need. You could coc to the location from an earlier save game, and take any 'GetStage > 50) conditions off your package while you check whether it's working at all.



I've been able to switch from a forcegreet package to a scene and back again ok, but scenes and dialogues are really different, so I'm not sure quite what you mean.

I am using scene , but it just not working , there is no way I can make it work dunno why I copied exactly the same stuff of the MQ02 .... should I give up ? Are there other samples of forcegreets ? I can't get working ...

here is a tip for debugging:
1) in the first phase of your scene, add a papyrus fragment on start:
Debug.MessageBox("The scene has started")

Then, in the startup stage of your quest that contains your scene, put this code in the stage:
Debug.MessageBox("The Quest has started")

Then using those while playing you can determine if
A) The quest is starting but the scene is not
Neither is starting at all
C) Both are starting, but the scene is not doing what you expect

I did eventually get forcegreet from a scene to work. But it's impotant that your topic be a top-level starting topic in a *blocking* dialogue branch. have you met those conditions?

needs to be a blocking dialogue ?