I got a problem. When I am modeling with nurbs, and wants to insert isoparms on an object, the object gets completely unchangeable afterwards.

I cant move any vertices or anything once after I have inserted an isoparm. I can move as an object but not the parts.

How come? This is extremely anoying and It's quite a handicap not being able to use this tool in the right way.

Why is my nurbs getting "freezed" or what to call it?