angularJS not parsing array of strings

Okay, I've been bashing my head bloody on this one:

I have the following JSON coming back from the server:

{
    "SendDate" : "2015-03-16T22:48:27.747",
    "SendTo" : {
        "ContactIds" : ["28a24538-cdfc-4453-920d-86f57d7eaf22"],
        "GroupIds" : []
    },
    "Message" : "MEETING TIME!!!!!"
}

I have checked this with several REST clients - this IS what comes back.

I have AngularJS "getting" this with an $http.get() operation, but I get an undefined on the "ContactIds" value - so, what I see in the JS Console is:

SendDate : "2015-03-16T22:48:27.747"
SendTo: 
  ContactIds: Array[1]
    0: undefined
    length: 1

I have NO IDEA what can be causing this.

Any ideas?

UPDATE: I have attached an interceptor and intercepted the response and the result is the same when I feed the data to the console - but when I use:

JSON.stringify(data)

I can see that the Data in the Array is THERE!

UPDATE 2:

Okay now this is driving me nuts. I have played with the interceptor and if I stringify the response and then use JSON.parse() - it works fine, but when I pass the response through, it comes out messed up again.

I traced it through angular's parsing process all the way to the "fromJson()" function. (code below:) It comes into the function as a string. (Now here's the Bizzarro part)

I altered the code like this:

function fromJson(json) {

    var obj1 = JSON.parse(json);
    console.log("Obj1:");
    console.log(obj1);

    //my altered angular code
    var obj2 = isString(json) ? JSON.parse(json) : json;  
    console.log("Obj2:");
    console.log(obj2);

    //  Pass to program...
    return obj1;
    //return obj2;

    /*  original angular code:
    return isString(json)
        ? JSON.parse(json)
        : json;
    */
}

If I run it and return obj1, the console logs obj1's ContactIds "0" index as "undefined" - but obj2 logs as "28a24538-cdfc-4453-920d-86f57d7eaf22".

"GREAT!", I'm thinking - so I return obj2, but now it logs undefined but obj1's "0" index is now the correct value. (WTH?)

So I reverse the code, just to see, and Return obj1 - and I'll be damned - obj2 returns "28a24538-cdfc-4453-920d-86f57d7eaf22" and obj1 is undefined. (It's like teasing a monkey.)

It HAS to be something later on in the pipeline that is doing it - OR - it may have something to do with the array being GUID strings - but I use GUID strings elsewhere with no problems.

It could also be another "angular process" that I'm unaware of that is causing this - angular is quite impressive.

Either way, I'm super-confused.

This is so stupid - I'm surprised that an array of strings is such a difficulty - and what's worse, it seems I'm the only one having this problem. (I researched this for six hours yesterday...)

Any other ideas, guys?