Win 7 64bit - If extract part and want to change score, program crash

...:( Very bad, but i have to state, than system of making part is not good at all...Make it interactivaly like in Sibelius...you can choose from list to see or update part of score, for example cues and imidietaly change (in hidding mode) in score. No extractin, no saving to other part....This way is very slow and uneffective and finaly now unfunctional...