[mgbmike]

OK, I troubleshot the mission "SM Planes For Rabaul".

The DEAkizuki does not exist on my system.
Maybe because of a mod I've added or maybe it's available on other users systems only.
My fix was to subsitute another destroyer.

How I found it:

Start the editor.
Load the mission. Don't try to zoom in or anything.
Click the explorer tab at the upper right in the editor.
Click the task force + to open it.
Right click on each ship, then left click properties.
If it loads the properties screen that ship is OK.
If it crashes the editor you just found the problem ship.

You can replace the offending ship using notepad to edit the mission (.mis) file.
Only the first three lines of the bad ship need to be replaced.

This is only one possibility of errors within a mission.