I'am running pdflatex from Texshop 3.18 on OS X 10.8.4 with Synctex and the inverse search is not working, meaning from the output pdf back to the source window. Command left clicking the pdf does nothing.
The opposite, from source to preview is not a problem.
As detailed in an earlier question, I've set the sync method to
synctex and pdflatex is configured as follows:
pdflatex --shell-escape --file-line-error --syncteX=1