I've found the problem and it wasn't related with the image itself. I'm explaining it to maybe help someone that gets in the same trouble:
- I had the system constantly checking the value of a "GameState" var, so when it was "Win", it could start showing the Win Interface.
- When GameState="Win", the system creates an instance of the Win Interface.
The problem was that i forgot to change again the "GameState" var when the Loading Win screen event is finished, to don't allow the system enter in that event again. System was knowing that it was in "Win" state and it was creating Win interfaces eternally.
This situation was not only progresively slowing the cpu, but making the interface image looks in that strange way i showed. So now it works fine and the image is rendered correctly.
Thanks anyways guys for trying to find a solution, i'm kinda new with Construct 2 and still having noob problems.