> Yes, but you didn't tell us you are running 4.3, you only mentioned
> unstable, so I assumed you were running 4.2.
My bad, thought I mentioned that I was running 4.3 from experimental

> Sounds like it could be related to heat?
Shouldn't be; OS X runs just fine in a hot room, although I will look into this
 
>(I assume the effect doesn't get captured on
> screenshots taken directly from the iBook?). 
xwd produces clean screenshots

>Does any of the following
> have an effect?
> 
>       * running at a different depth
>       * switching to console and back to X (possibly repeatedly)
>       * not using Option "UseFBDev" (unlikely to work with 4.3 though)

Depth of 8, 16, 24, all affected. Repeated switching of terminals does not 
help. Turning off UseFBDev leads to BAD display corruption and a hard hang 
after a few seconds. 

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