I have flown the PMDG737NG for some time and have been used to using the 2D panel. Now I have the PMDG 737NGX and the 2D panel seems to be streched in the vertical direction somewhat. How can this be fixed ? Please see attachment for what I mean.

Go to the display section in your fsx.cfg file and check how WideViewAspect is set.If you're using a 4:3 monitor set it to False.If you're using a 16:9/10 monitor set it to True.That should fix it.Edit: I think there's something else to be done if you want the 4:3 panel. A forum search should turn it up.