AutoCad 2D :: Lines (angled) Move On Zoom In But Remain Static If Selected?

I have just been doing some work for a company and they were using AutoCAD 2009.

One of my tasks involved stretching and moving items from imported drawings over Architectural layouts. Lines drawn on the x and y axis were fine. However, if I zoomed in on angled lines they moved out of view making them difficult to select or position to a snap point. If I selected those lines then they remained in place when I zoomed in.

When I approached the company manager he replied by saying that he would zoom in then zoom out to the point where the lines were correct and in place. I thought that he was either joking or was testing me! It meant I could not do any detailed work - which contradicts the use of Auto CAD.

The question has to consider the fact that the lines were angled and that they remained static when selected. When zooming in and selecting them they were off and running out of the screen view. also note that my colleague at the next desk opened up the file on V2008 and he could zoom in okay. I was also using a wide screen if this matters.