About three weeks ago I went through a major day-and-a-half battle to
get a Mac Pro 5,1 on OS 10.9.2 to behave. I was getting bizarre Finder
crashes, infinite beachballs when trying to import any element at all
into AE, even Disk Utility freezing up.  I did a major update to my
backups, did a clean install of Mavericks and reinstalled all apps and
plugins one by one.  That took most of a day.

However the machine was still intermittently unusable, even to the point
of refusing to Shut Down properly.  Next thought was "bad RAM."  I
started removing and swapping RAM sticks until I narrowed it down to the
one that seemed to be the culprit. Bam. Looking good again.

Until today when the problem recurred. Long story short, through Console
I traced the problem to a disk i/o error on an external Firewire drive.
Console is pretty great. I took the drive off-line and everything was
back to normal.

Huh. Machines.

I learned that many symptoms can be caused by many things, not always
the most "logical" or the first thing that comes to mind.

Robert W. Walker
Los Angeles CA USA

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