I have a single part, some complexity with curves, It loads up ok but when I go to edit any of the sketches or add a new sketch it hangs at the point of editing or adding a dimension, When I look at the task manager the CPU is churning at 100%! and if left nothing changes! I'm guessing the file is currupted some how, is there anyway to try and solve this without drawing the piece again! My only option so far has been to shut down SW and restart SW, OS keeps working ok! hasn't happened with any other pieces! SW2003 Win2000 Cheers Olly