To any pgf/tikz experts out there, can you help this poor soul.
tex.stackexchange.com/q/24753/2693. His problem is NOT with memory, AFAICT but with a failure of the externalization system command. I know very little about this, and his sample document compiles fine for me on essentially the same setup. Our log files are almost identical except for where the system call fails. If you use a Mac, even better, since he seems a bit lost in general.