Hello,
thank you for your comments 
I started another animation, I’m trying now to make a more complex picture.
vimeo.com/8651015
it’s just a beginning, and I still do not have any scenario…
Room made with Blender.
Very very nice!!
And the light effect too?
-G
no, light effect with synfig, and curtain with Synfig
Very impressive!
Thank you for your comments
it’s a little bit longer, but the movements of the face are not very good 
http://www.vimeo.com/8891164
I think that it is very good!
and I didn’t realize that there was a cat in the first scene!
-G
Hello, and thank you for your comments
I advanced a little, but maybe the file is too big, Synfig becomes really buggy. I will try to continue in another view.
http://www.vimeo.com/8943110
Can we help on debug it? Any kind of repetitive scheme to make it crash? Operating System and version? 
-G
Thank you Genete,
I have Synfig Studio 0.62.00, and Windows XP.
Sometimes, the program closes, but maybe also because I make mistakes … no problem since everything is recovered when I open again.
The most disturbing is when I create a new key: if I move the points, the display jumps to the next or previous key, I don’t know, and I have to move the cursor among the keys to see shape that I am changing.
Sorry, I can’t explain much better in English 
Do you use a multi core CPU?
It is important that you confirm it because it is one of the biggest problems of Synfig for windows.
If you have a multicore cpu please test and use the experimental new build that uses a single thread for the renderer.
Doenload it here:
synfig.org/es/download
Be sure that you have the “Use one thead only” option enabled.
Check out here any problem you have.
-G
Thank you Genete,
yes, my CPU is dual-core.
I will try your experimental build .