FS2004 Flight Planner - Not load flight originating in UK

I have three issues all focusing on England and flight plans.

1. I am trying to load a flight plan where the starting airport is in England, but the FS2004 Flight Planner will not load it. It will load flight plans when the starting airport is outside of England, for example in Germany. I have created these flight plans using Plan-G. 

2. Furthermore, when I try to create a flight plan using the FS2004 Flight Planner, I cannot SAVE the flight plan when the starting airport is in England.

3. I created a flight plan, again using Plan-G where the starting airport was in Germany and it terminated in England. About half way through that flight my FS2004 CTD. I looked in the Events Viewer and saw the error and it listed the TERRAIN.DLL as being the problem.

What I have attempted to do:

I have UT-Europe installed. I have tried to disable it, but that did not resolve anything. 

I have deactivated all of my aircraft with the exception of one, and that wasn't the issue.

Using my Scenery Config Editor, I deactivated all of my scenery for the UK and surrounding countries - that didn't resolve anything.

Just as a side note - at first, as soon as I tried to use the FS2004 Flight Planner my FS2004 would CTD. I did find one file in my FS2004/SCENERY/EURW/Scenery folder that was corrupt, and replaced it. That eliminated the CTD problem.

I am running my FS2004 on a Windows 10 computer. I have plenty of memory and hard drive space.

I sure would appreciate any guidance anyone can offer. I have been fight this issue for the past week.

Thank you, very much.

Harry

Edited April 18Apr 18 by hlg