GUI.DrawTexture Flickering. Help is greatly appreciated!

Hello everyone.

I have been going through a problem for a lot of hours but not able to find the solution. I have a Texture that I have split into chunks. In Editor, I want to display each chunk together to form the new Texture again. But when I try GUI.DrawTexture, for each tile(chunk), you can see some flickering(not correct colors 100%).
This GUI.DrawTexture Functions are all in a GUILayout.BeginArea(). When I remove this GUILayout.BeginArea(), the flickering is gone.

My question is : Since I use a lot of BeginArea() functions, is there any restrictions or something I dont know. What should I use best for drawing Textures?

Thanks in advance.

(Error shown here : )

 

Put all your GUI.DrawTexture() calls into OnGUI() instead.

 

The GUI calls, all of them, are in OnGUI(), otherwise there would be nothing to see.