I'm not an OS X user, but two things you might look into/help you troubleshoot:
1. Because you said it only happens when you try to overwrite an
existing PDF, could it be that there is another process holding onto
(=locking) the PDF file that you're trying to write to? For instance,
are you
Dear Wolfgang,
Thanks for your response.
No, I haven't tried doing the complete reinstallation as you suggest. If I
recall correctly, this has happened on previous occasions but like I said
in my email it's not all that disruptive to my workflow. It's more like a
'first world problem'.
I was
Dear Neil
Have you tried with completely uninstalling your R, and reinstalling a more
recent version (e.g. 3.2.4 right now).
And then the same with your operating system - OS X is currently at 10.11.4.
There is likely not much interest (or benefit) in chasing such things in
obsolete versions.
Dear colleagues,
I wish to report a problem I encounter when trying to save a graphic to
file. When I produce a graphic and try to save it R becomes unresponsive
and I must force quit, and then restart R. The problem occurs when I try to
overwrite an existing graphic: for example when I made
