Uv mapping problem

When i entered texture paint mode i saw that my model got a pair of new holes and after that i had uv mapped him the holes were still there. I have no clue on how to solve it, so thats why i came here :slight_smile:
Heres a pciture of the model and the rings are placed around the holes
http://i43.tinypic.com/2v275ts.jpg
Marking the lines and press f doesnt work, when i press f it says that its already a “dont remember word” there.

Did you render it? Check if there maybe is some other transparent material.

The faces may be pointing inwards instead of outwards
Select all vertices then Ctrl+N to recalculate the normals.
If there are still errors, select those faces and W / Flip Normals