A user I support is having an issue with solid works and originally I was told by him that it was a graphics issue but the graphics card seems fine (it has identical settings to another user who has had no issues).  The user is modeling in solidworks and when he zooms in to better select lines sometimes he will click the line to select it.  After the line has been clicked if it is manipulated only a small box around the part of the line will move around and the rest of the model visible on the screen will be stationary.  Has anyone had similar issues?  Could this be a case of a setting within solidworks that needs to be changed?  Or did I miss something and it is being caused my a graphics problem?

Thank you