Black Preview Bug

Can someone tell me whether the black preview bug is a known issue? I have the latest Aperture version 1.5.6 and am using Leopard. As soon as I make an adjustment my preview vanishes to black. If I turn the adjustment off it returns.
For Pro software this is not what I would expect, Leopard release or not. This is causing a serious disruption to my workflow. Does any one have any workarounds for this issue other than exporting everything to Photoshop and adjusting there?

Some hit the problem, some don't. Some have reported it as "fixed" (i.e. no longer occuring) with subsequent Aperture or ProApps framework updates.
It seems to vary with the graphics hardware your machine has, and even sometimes according to what Colorsync profile you might be using.

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