Bug in screensaver OR graphic card? Help me figure this out

I have a 15" MacBook Pro 2.66 GHz purchased in late September 2009. There is an odd bug that shows up in the mosaic screensaver (the one that represents one of your iPhoto pictures using a mosaic of your other photos) when I use the "Better Graphics" settings. If you have a similar computer, see if you can replicate this bug and let me know I'm not crazy...
This 10.6 standard screensaver shows a single picture, then zooms out to show that picture as part of a mosaic that represents one of your other pictures in iPhoto. When the photo mosaic is complete, it gradually dissolves into the actual photo, then repeats the process using that photo as part of a mosaic.
This screensaver works perfectly when running on the default NVIDIA GeoForce 9400M graphics card. When I switch to "Higher Performance" graphics and use the NVIDIA GeoForce 9600M GT card, the final image before the dissolve flips upside down, then dissolves into a right-side-up version of the image and starts the mosaic process again. Very odd!
I have noticed no other issues on my computer when using "Higher Performance" graphics, but this one is weird and disturbing because it is in an Apple screensaver. Any thoughts or experiences with this?

Thanks for the suggestion - after someone else reproduced the problem on their MacBook Pro, I submitted a bug report. It's not a big deal, but this should probably be fixed.

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