Machine lockup when using World Community Grid software

I have a T60p with 3 GB of memory.  I have all the latest BIOS and Thinkvantage updates.
I run the World Community Grid software (http://www.worldcommunitygrid.org/) which uses my laptop for "worthwhile" scientific computing activities while the laptop is otherwise unused.  This software has a setting to limit the CPU usage of this software.  When I permit the World Community Grid to use 90% of the CPU of the laptop, I get occasional machine lockups, meaning that the machine suddenly stops responding to the keyboard and mouse.  The problem does not happen when I set the software to use 50% of the CPU capacity.
I suspect that this has to do with machine overheating.  The air coming out of the vents gets noticeably warm when running this software.  I am careful to keep the machine in a well-ventilated and airconditioned office-type environment.
I complained about this on one of the World Community Grid forums (https://secure.worldcommunitygrid.org/forums/wcg/v​iewthread?thread=18443) , and another user indicated that he/she has the same problem.
So my question: shouldn't the system BIOS prevent the machine from overheating?  I would think that a lockup like this indicates a bug.

Hi Rodney,
Firstly, thank you for your time replying to my question.
After looking around for this problem, I do think there is a bug in the new firewall that comes with Leopard, the so called Application Firewall (http://support.apple.com/kb/HT1810?viewlocale=en_US). With the old ipfw I had not problem whatsoever, but this new one is giving my a headache...
After reading this
http://gp.darkproductions.com/2007/11/summary-of-leopard-firewall-issues.html
I guess I will fuss around with the ipfw using a GUI such as WaterRoof (http://www.hanynet.com/waterroof/).
But getting back to the explanations, my situation was exactly where you still are: using one machine with Leopard and the other with Tiger, things were fine. But after upgrading the laptop to Leopard too, the iMac and the MBPro do not talk to each other anymore. Unless, of course, I set both machines' firewall to "Allow All Incoming Connections" -- which is less than desirable, right?
If one machine is with its firewall set to anything different than "Allow All Incoming Connections", than the other cannot see it. Neither through Finder, neither through Go | Connect to server..., nothing.
When I access the firewall's log, I see that the other machine is trying to connect, but all the incoming traffic gets blocked and the message is always the same:
*Jun 30 21:13:56 xxx Firewall[71]: Deny AppleFileServer connecting from 192.168.1.xxx:53850 uid = 0 proto=6*
Here is another thread in the forum that shows more people suffering from the same problem:
http://discussions.apple.com/thread.jspa?threadID=1464407&start=0&tstart=0
In the meantime, I will have to be transferring my files using an USB drive... :/
Thanks,
BZdM

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