Anyone ever seen crashes like this before?

http://www.alpinesoft.co.uk/private/crash1.txt
http://www.alpinesoft.co.uk/private/crash2.txt
http://www.alpinesoft.co.uk/private/crash3.txt

These (just these 3) have been reported by customers over the last month or so. 
 We have only seen them on Snow Leopard, but we hardly have a statistical 
sample.  I have never seen it during development or testing.  It seems to be 
connected with disposal of a QLPreviewView by NSOpenPanel when it is closed.  
Note that it's not the main thread that crashes, but it looks like it's doing 
something that whipped the rug out from under the thread that did.  Note also 
that in all cases the faulting address appears to be part of an ASCII string 
(and not one I recognise).

I have raised a bug report about this (7826287) but I thought I'd see if 
anybody here has seen something similar.  I don't think it's us.  I like to 
think that we see these weird, rare crashes because of the reporting facility 
(based on Uli Kusterer's UKCrashReporter) built into our software, rather than 
the fact that we have lots of bugs in our own code.  AFAIK, we are good 
citizens when it comes to respecting other people's memory, but you can never 
be 100% sure.

Paul Sanders.
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