Logic X: No guitar sound

I'm using a MacBook Pro and running Logic 11.1.2.

All of a sudden, I'm not getting guitar sound through Logic.

My software instruments work fine in Logic.

My guitar sound is there when I use GarageBand.

I've double checked my settings. I'm mirroring my MacMini where Logic works fine. I've reinstalled Logic and NO JOY.

I've read through a few other threads where this same issue has been discussed but none of the solutions have helped.

I've used Logic for a while.

Thanks in advance for all suggestions.