I've started learning blender recently. Currently, I'm doing the apple tutorial by CGBoost.
In the viewport, the objects go out of control and showing weird thins, as shown below.
However, when I render the scene with the cycles engine the result is normal:
This problem occurred when I've cut an apple in two and added a new texture to the top part.
I was wondering maybe it's a caching problem which I have to clear or maybe it's a bug?
Please help.