Hi Mick,
Indeed - there is a bug in AutoCAD for Mac (even after latest update):
"AutoCAD crashes when you try to load two or more applications via APPLOAD dialog ("Add to history" check-mark should be ON). Here are steps to reproduce crash:
1. Start AutoCAD
2. Start APPLOAD command
3. In Appload dialog select two lisp files to load from some folder on disk, not from history list (select one, then Command-select second)
4. Enable "Add to history"
5. Click on Load button - AutoCAD crashes."
So to avoid this crash I can advice you to load routines separately (one by one) with "Add to history" checked. After you have populated "History list" in APPLOAD dialog, you can select multiple routines from this "History list" and load it without AotoCAD crashing.
Another way is to put necessary routines to "Startup Suite" in APPLOAD dialog.

HTH
Maxim