I was just extruding and resizing a mesh model using the hide function to reduce the vertex number on screen… after a number of modifications, hide and unhide commands and some scaling of the entire model, I see that some spheric parts of the model get deformed in a way that I don’t want… Since I don’t use proportional vertex editing on that model and I have assurance that I don’t touch these vertexes that were hide all the time I make estrude and other modification to my model, I can’t realize what is going on…
Anyome have any idea? 
Are you able to repeat the problem? If so, can you give us an example?
I will try to repeat the problem and post a new reply…
I don’t know exaclty whem the problem really occurs.
It shows itself tree or four more times, two of them in a diferent situation (whem I try to use the loft command with a group of deformed surface circles… all gone well, except for a goup of vertexes that get out of their wanted positions).
I will try to reproduce both situations and maybe place the exemples on this topic… At this point, maybe I have more information and see if it was my fault or not…
May I was precipitated to post this topic without having a more clear knowledge of the problem! :-?