Chriszolezzi, just to make you happy:
you are not alone with this problem, I have it too...
My configuration is the same as yours, and the important part of our configuration in this case is the 4GB of RAM.
But let's start with basics...
Usually the system crash happens when starting AC 10 (at least 5 out of 10 times). If the system survives the startup of archicad you can make sure AC 10 will take the system down within 15 minute.
However if I remove the extra 2GB of RAM (out of 4GB) it works great, without a hitch. No other app ever crashed the system with 4GB of RAM only AC 10.
(Most of the time 2-2,5GB is in use by other apps)
The strange thing is that I tested both pairs of RAM (2x1GB + 2x1GB) with AC 10 separately and they preform OK, but if both pairs (2x1GB + 2x1GB) are installed AC 10 crashes the whole system right away.
I tested with (512+512)+(1GB+1GB) of RAM and (1GB+1GB)+(1GB+1GB) = no luck.
I even tried with 3 different type of RAM - same bad result...
Seems like AC 10 is unable to run with more than 2GB of RAM on Mac Pro.
(Is there anyone with 4GB to confirm the opposite?)
Trashing the pref files did not help, reinstall likewise.
It also crashes with another WIBUKEY.
I also made a test with PPC version of AC 10 and it crashes the entire system just like the Intel version.
And now a surprise: AC 9 works great (however slow because of Rosetta),
but at least it does not crash the whole system.
Now I work with 2x1GB of RAM until I get some response from Graphisoft's Bug Tracking team.
May I ask you Chriszolezzi to try the same as I did: work with just 2 GB of RAM and let us know if that changed anything?
Thanx
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Mac Pro 2x 2.66ghz Dual Core Intel Xeon, 4GB RAM, Mac OS X 10.4.8 Archicad 10 (intel)