Hi Jerseydave,
Is it LR 6 or LR CC that you are using ?
When exactly does it crash ?
Also can you please try launching LR from terminal and see if it crashes and what is the error that you get.
- Open finder- applications
- Go to LR application, CTRL click on it, click on shoe package content - Mac OS X and then launch LR from there.
Please let us know the results.
Regards
Rohit