ok, i've made sure that i had all those settings that were recommended, i'm now getting the following very strange effect... the light IS now coming through the hole as it is supposed to, however where the light should be hitting the back of the wall, its now still showing right through the wall in black. I have absolutely no idea why this is happening. I've posted the scene file and object in the following post for y'all to have a look at to see if anyone can solve this.
Note: If i set the color of the object to black, then you can't see the black sections coming through, but for the purposes of the scene i'm working on, i don't want this surface to be just black.
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