You wrote:

Mac OS is the whole operating system; Darwin is the Unix-based "core" of the operating system. So Darwin is part of the Mac OS, which runs on both Intel- and PowerPC-based Macs.

By the way, I just discovered that for yesterday evening's crash, there is no useful info. in stderrgui.txt at all. The time of the crash (19:09:09) I took from stdoutdae.txt, which gives the usual "Exit requested by user" message. The console.log from that day shows a possible issue with the Java VM in a web browser, but no BOINC-related trouble.

Now, I noticed you moved this thread out of the dddt forum... scared me for a moment there. I have not been fully convinced yet that it is merely a coincidence that this happened around the time the dddt work units got longer, but it's always possible that something funny is going on with the OS on my machine. I am curious what projects the other user(s) with the same trouble is/are running.

You wrote:

I use both. I ordinarily do not run BOINC with the window closed completely; other than that, I do not recall which application was in the "foreground" or which view I was using during any of the crashes. What I do remember is that for the 03/15/2008 crash, I had been away from the computer for a while and would have expected the display to have fallen "asleep," but because of the crash, the whole computer had fallen "asleep" instead. I typically use the advanced view more often than the simple view, but switch back and forth between them quite often; when I am using the advanced view, it is usually the "accessible" rather than the "grid" view. The problem seems to occur near the end of a DDDT unit; looking at the Result Log for dddt0401o0873_ 100446_ 1-- (which is still Pending Validation, by the way):

....

Finished Docking number 95
Finished Docking number 96
Finished Docking number 97
Finished Docking number 98
Finished Docking number 99

________________________________________________________________________________

autodock4: Successful Completion on "World Community Grid device"

________________________________________________________________________________

INFO:[01:09:40] Start AutoGrid...

autogrid: autogrid4: Successful Completion.
INFO:[01:10:49] End AutoGrid...
Beginning AutoDock...
INFO: Setting num_generations: 27000
About to enter main loop...(dockings already completed: 600)

»I believe the incident occurred roughly about here.«

About to call graphics init
Restoring grahics. bestEnergy: -7.390050 maxGenSeen: 6750
INFO:[02:36:42] Start AutoGrid...

autogrid: autogrid4: Successful Completion.
INFO:[02:37:59] End AutoGrid...
Beginning AutoDock...
INFO: Setting num_generations: 27000
About to enter main loop...(dockings already completed: 600)
Finished Docking number 0

________________________________________________________________________________

autodock4: Successful Completion on "World Community Grid device"

________________________________________________________________________________

Is the fact of me switching back and forth between the simple and advanced view perhaps contributing to the trouble?

I mentioned the simple view because the crash seems to occur in the simple view code.

Perhaps you could try using the advanced view exclusively for a few weeks?

Meanwhile, the BOINC developers have the report, and I don't think there is any additional information you can provide at this time. Yours is a "hard bug" - it can't be reproduced on demand, so it is difficult to track down and fix. So, it may take a while.

BOINC have released 6.2 to a wider audience. WCG haven't adopted it yet, but you may want to try it and see if the new version has this bug.