BoM Balloons get scattered in Creo 2.0

Dear all,

Recently I have switched over to Creo 2.0 from Proe WF 4.0.

I am placing BoM balloons in the drawing for very large assembly with simp reps.

I keep all balloons lines vertical and save the drawing.

When I open drawing again at that time all balloons get scattered. I donot know whether it is becuase of any change in assembly or it has to do something with config file.

Thanks.

Vimlesh