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I just tried it again with the latest version and it is now working properly with my 7800GTX 512.

When I processed a 6072x4300 600dpi image with default settings:
CPU took 174 seconds
GPU took 26 seconds

It also seems work fine even when I have all OpenGL acceleration features enabled in Photoshop CS4, which is nice.

Thanks petopeto.

Would it be possible to add the revision number to the preview window title?

Could you also add the zoom percentage to the the preview window? It is hard to know when you are back to 100%. Zooming out has always seemed to produce an ugly preview. Any chance of improving the preview downscale resizing (using bilinear)?