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Photoshop added new bugs to its allocator around CS5 or CS6, which led to crashes and mysterious PS misbehavior (sometimes later on, while not using the plugin and editing a different image, which was a feature nobody liked), so it was removed to use the system allocator.

I've run both plugins back and forth over 10-15 times on a 16-bit 8000x11000 image in CS4 32-bit without issue...