Problem with looping concatenation with custom class

I have an array of objects, a custom class that has an attribute called 'commentUID.' I'm trying to output a string that combines the commentUID of each object with a comma in between. However, my script won't add anything past the first object, and I have no idea why. It's running through the loop...it's just not adding the commentUID strings. If I try it with another type of object, like have it add a simple string, it works as expected. Any ideas?

 var allComments : commentObj[] = new commentObj[0];
 
 class commentObj { 
 
     //Use this number to assign the Alr
     private var projectID : int = 1;
 
     var commentUID : String;
 
     var user : userInfo;
     var userPos : userPosition;
     
     var target : GameObject;
     var targetPosition : Vector3;
     
     var view : Texture2D;
     var date : System.DateTime = System.DateTime.Now;
     var text : String;
 }
 
     var CommentString : String;
     
     for (var x = 0; x<allComments.Length; x++){
         if(x == 0){
             CommentString = allComments[x].commentUID;
             Debug.Log("Ran Once");
         }
         else{
             CommentString = CommentString + "," + allComments[x].commentUID;
             Debug.Log("Ran " + (x+1) + " times");
         }
     }