Pixelation / digital squares on images in Slideshow

Quite often in Slideshow in LR I get images which are not properly processed by Lightroom, that is to say that it's as tho' my machine can't process the image and display it properly -- the images are a montage of the original in large (2 or 3 millimetre) digital squares. Any idea why? (I have a decent machine (MacBook Pro with 2GB of RAM running nothing else and with acres of storage on tap)).

I've never figured out the exact reason for this, but I suspect it's because the standard-sized previews aren't built. Building them on import isn't enough if you edit them as thumbs in library, either by using QD or by copying and pasting settings from image to image.
Try selecting all time images for the slide show first, and then hitting render standard previews. See if that works reliably.

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