On the Mac computer:
The error you're getting for AM3 regional models is:
Model crashed: INITDUMP: Wrong no of atmos prognostic fields
Not sure what that means. Seems like the researchers made a technical mistake with that batch of tasks.
However, the HadCM3 models crash with this:
process exited with code 22 (0x16, -234)
which AFAIK means permissions problems. Perhaps there's something on your end that needs fixing?