Here's a scene I made - it's in my dropbox for you (temporarily).

https://www.dropbox.com/s/szz3q2l9vt5nyq9/ShadowScreen.pz3?dl=0

It's really simple and looks like this.

If it looks like this for you, too, then you should study it to find what you're doing differently.

It uses no maps so all you need is the scene file.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)