Yeah, I think I know what you're talking about, I'm not using any shaders yet in the screen I've posted to get the effect though, however in my code there are shader codes.

That might very well explain some of the odd behavior, even if they are not active. Did you mean this? The effect itself as shown on the screenshot doesn't use a shader atm. I'm planning to change that though and add a shader, we'll see what happens then.

I have to add to the incompatibility issue by the way, that sometimes my stencil shadows dissappeared too .. it must be something out there that's causing all this, I swear the upper screenshot has exactly the same code as Ichiro first posted, so it's definately not the code. It might have got to do something with render-to-texture, maybe this isn't as stable and consistent as we all expect it to be?

Cheers