Hi
A couple of things you could look at (if you haven't already) are:
1) Running the ioncube/ioncube-loader-helper.php file for diagnostics
2) Find out if you are running PHP in threaded mode or not. If you are, you need your php.ini to point to ioncube_loader_dar_5.2_ts.so , remembering to restart the server once the change has been made.
I'd be happy to help directly with the installation if it were on an online dev server, but with a local Mac server there's not a whole lot more I can do apart from suggest a few links which may be useful:
forum.ioncube.com/viewtopic.php?t=2853&a...92019502eb95bd5e5c08 forum.mamp.info/viewtopic.php?f=2&t=6875 forum.joomla.org/viewtopic.php?f=35&t=270995 Sorry for the inconvenience.
Nick