Thanks for the reply. Yes I am running on Native Mac OSx El Capitan. I think I have found the culprit of the crash issue and that is the UA-25x. I removed it from my computer last night and ran with just the built in Audio and everything worked fine. I will try my Scarlett 2x2 this evening and see what happens with it. Checked out your website and enjoyed the music and videos I listened to.

Dennis