I have a problem with one specific drawing where I have created a right viewport; however, if I doubleclick in the port to enter model space, the viewport automatically changes to a top view. If the viewport is locked, no change to the view. This problem only exhibits itself in one drawing so it must be some setting that is drawing specific. Any thoughts about what I need to change? ACAD MEP 2012
Thanks in advance for any help that you can provide.