Problem with erase effect

Hello, I'm just starting to use construct so please bear with my noobishness <img src="smileys/smiley2.gif" border="0" align="middle" />, I'm trying to use the erase effect to create a transparent figure on a layer that acts as a "window" (in the game the figure will move with the player and it will allow to see a layer below) and when I do it in the editor is all fine and works as I intended it to, but when I run the layout the sprite which should be transparent (the sprite with the erase effect) appears black... please help me, if I didn't get my problem across I'll try to explain it better

Make sure you've ticked Force own texture in the layer settings, otherwise the Erase shader "cuts through" the entire render wall.

<img src="http://i.imgur.com/rLM6g.png" border="0" />

<img src="smileys/smiley20.gif" border="0" align="middle" /> Thank you VERY much, it was just that!!!