Hello! Im having trouble with Grow From Seeds. Basically, sometimes it works… sometimes it doesnt. Im about to give up and start working with some other software. Does it happen to any of you, with this option? I will gladly listen to your recomendations, thank you so much,
Mercedes.-
It is not an algorithm that sometimes works sometimes doesn’t - it is very predictable, consistently separating regions that have a slight intensity difference between them.
If you can share your scene or a screen capture video then we can give advice about what to do differently. (upload the file somewhere and post the link here)
I was able to solve it, thank you for your answer !
That’s great 
If you hit an issue that others might learn from it would be great if you could report what that was and how you got past it.
Of course, my mistake was that I tried to segment just one segment (many spots on one segment). I realised that in order for this option to work, you have to work on, al least, two segments. Inspite it doesn’t make much sense to me, it works this way. I didn’t have problems since. I´m grateful for the quick answers tough, It really makes me feel less lonely in this learning path 
I’m learning by myself, and many times I don’t understand and get frustrated. Thanks !
You need to have at least two competing segments because this effect performs competitive region growind: segments are grown until they fill the entire region of interest or reach another segment. If you only have one segment then that will fill the entire region.
I’ve submitted a pull request that adds a popup window to remind the user that two input segments are needed. It’ll be in the Slicer Preview Release within a couple of days: