Gaussian Blur ruins my image

Hi
For some reason I am getting this problem where I cut out an image, use gaussian blur and then my image gets all messed up, with squaires, circles and lines starting to appear on the layer of the cut out image. (What is weird is I wasnt even using blur on this layer!!) This is what happens below:
It has only started doing this and I cant seem to work out how to stop it. I have even installed the latest updates of photoshop but that did nothing.
Hope you can help
Ryan

Did you read the warning when you enabled Ray-traced 3d? You have to nest your RT layer in a classic 3D comp and then apply the effects. Do not collapse transformations... Check the third and fourth line from the bottom.

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