Assigning script-generated textures

Hello everyone, new guy here. I've come across a particularly strange problem (I t$$anonymous$$nk).

So I'm trying to recreate an old game and one of the requirements I've set myself is that my program has to be compatible with the old game's data files (w$$anonymous$$ch are in an old format that's not supported by Unity). One of these data files contains textures, and as far as I can tell the code I've written is reading those out properly. The problems start when I try to assign a texture to a Unity 3D object: the texture simply does not show up, and the object remains its default w$$anonymous$$te-greyish color. Here's the test code I'm working with at the moment (simplified):

 //t$$anonymous$$s script is attached to an empty GameObject
 public class Initialize : MonoBehaviour {
     Style theStyle;
     List<GameObject> gameObjects;
     void Awake () {
         readStyle ();
         gameObjects=new List<GameObject>();
     }
     private void readStyle()
     {
         //stuff happens here that reads out a file, creates a Style object and assigns it to theStyle.
         //It contains public Texture2D[] tileTextures, w$$anonymous$$ch contains all textures.
     }
     void Start () {
         GameObject objectToAdd = GameObject.CreatePrimitive (PrimitiveType.Cube);
         objectToAdd.renderer.material.mainTexture=theStyle.tileTextures[10]; //just assigning one of the textures to the cube
         gameObjects.Add (objectToAdd);
     }
 }

The above code didn't work the way I expected it to: the cube that is created is untextured. I tried lots of t$$anonymous$$ngs to figure out what the problem was. One t$$anonymous$$ng I did was the following test: to check whether tileTextures actually contains textures and a texture gets properly assigned to the cube, I modified Start() as follows:

 void Start () {
     GameObject objectToAdd = GameObject.CreatePrimitive (PrimitiveType.Cube);
     objectToAdd.renderer.material.mainTexture=theStyle.tileTextures[10];
     File.WriteAllBytes(Application.dataPath + "/Resources/file12412.png", ((Texture2D)(objectToAdd.renderer.material.mainTexture)).EncodeToPNG ());
     Texture2D tex = Resources.Load("file12412") as Texture2D;
     objectToAdd.renderer.material.mainTexture = tex;
     gameObjects.Add (objectToAdd);
 }

So, basically, after assigning the texture to the cube, it then takes the cube's texture and exports it as a file. I inspected the resulting file (file12412.png) and it looks fine. After exporting the file, it then imports it again and assigns the imported texture to the cube. The reason I did that is because I wanted to see if a texture that is created using one of Unity's standard functions would actually work properly. It didn't produce any change at all though, but strangely enough, when I then ran the program again a little w$$anonymous$$le later, with the file12412.png file still in the Resources folder, the cube showed up textured correctly.

I then cleared the resources folder to verify t$$anonymous$$s behavior, and t$$anonymous$$s happened:

• 1st time running without anyt$$anonymous$$ng in the resources folder, the cube remained untextured.

• 2nd time running (immediately after the 1st time, but with the file that was generated during the 1st time running still in the resources folder), the cube remained untextured

• 3rd time running directly after the 2nd time, the cube shows up textured.

It seems to me Unity has to get used to the idea of there being a file in its resources folder or somet$$anonymous$$ng.

But the most important question is: Why isn't the cube showing up properly textured without all t$$anonymous$$s file exporting/importing? What am I doing wrong?

Feel free to ask for clarifications of course, and thanks in advance for any help!