There may be something similar in our context with ghostscript etc, and definitely we don';t know enough about Mac OS internals and files and notifications.
Also, allow me to clarify. When I said I cannot reproduce the problem, I went on to say that Preview is erratic. So in fact, I can reproduce the problem (apologies for being obtuse!). Preview only updates sometimes after a compile - this is what I mean by erratic.
It would be interesting to get to the bottom of this matte, but I fear we are dealing with deep internals issues here, in remote regions normally untrodden by mortals - the Mac OS kernel.
Skim works for me, but there seems to be something related to large files. I am trying one line scores, but Kieren I would imagine you have very large orchestral scores. This could be part of the plot, with file writes we don't fully have a handle on.
Andrew