problem in visualization of edges and in sketch environment after opening stp or igs or step file in nx 10 only?

i have problem in visualization and in sketch environment after opening stp or igs or step file in nx 10 only.
i have provide images that clear my problem.
this problem not come when i only file as file -new-open but when i open any stp or igs or step file in nx it gives problem for diamention visualisation in sketch environment and 3d edges of solid body.