My first guess is that Open GL is turned on for rendering. Try turning it off.
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Probaly what Rick said, but also look into layer styles or plug-ins that may break rendering order, including OpenGL-driven plug-ins like Magic Buillet Looks that may not work properly on your system.
Thank-you rick, worked a charm.
yes Mr Gerard was right, and yes I was using Magic Bullet looks but they seemed to play nicely on my system, once the open GL was turned off.
Now Im off to investigate exactly what open GL does...
thanks for your help.
Open GL rendering is useful for previews only because each Open GL card plays a little differently when rendering effects. The only way to get consistent results with different machines or to guarantee the your project will render as expected is to NOT use open GL for rendering.
Open GL is hardware accelerated image rendering created by the GPU (graphics card or display adaptor) in your system. There is a standard, but each manufacturer can implement different features.