ExecuteInEditMode not working in some scripts

I am using @script ExecuteInEditMode(); to update object sprites in the editor when I select a new enum dropdown value. This was working quite well until at some unknown point, it stopped working for almost every script. Is there a setting or object type that would keep this from executing in certain scripts but not others? I’ve searched every help topic i can find with no success.

The test code that works in some scripts and not others:

#pragma strict 
@script ExecuteInEditMode();

function Awake(){
     Debug.Log('Update');
}
function Start () {
     Debug.Log('Start');
}
function Update (){
     Debug.Log('Update');
}

I guess all this scripts are attached to items existing in the scene and that these items are active?

Also - Start and Awake will not work in editor
Update will only work when there is a change in the scene -

Did you try and make a change in the scene before you checked the debug report? e.g. check a boolean in an inspector.

Do the script which are not working in editor work in play mode?