www.makemkv.com

The latest version of MakeMKV has a bug causing crash when running on Mac OS X 10.5.8 Leopard . The program would crash either at start, when accessing preferences menu or at some other time. The problem happens only on 10.5.8 and the exact reason is yet unknown. If you experience this issue then your only choice is to upgrade your OS to 10.6.x ( or 10.7.x ) . We're working on the fix. Please accept our apologies.

I'm seeing this with Mac OS 10.6.7 and MakeMKV 1.6.8 as well.

I am seeing this issue with MakeMKV 1.6.8 and Mac OSx 10.6.7. Lastly, 10.7 isn't even out yet and won't be till this summer.

Fixed in 1.6.9