Logic Pro X No template audio playback, can't open "empty project"

I'm running Logic Pro X 10.3.3 on El Capitan. When trying to add tracks to a new project I only get "external MIDI" as active. Clicking gets my Firebox interface as an instrument. Adding any other track type gets error msg saying no more "room" to add tracks. Deleting the Firebox takes me back to choose project template.

After opening a template there was no audio playback from existing tracks. No audio signal was indicated but there were inaudible spikes shown on the meters when not in playback. The playback system itself is working fine.

I also got "Error while trying to synchronize audio and MIDI. Sample rate 41,509 detected. Check conflict between Logic Pro X and external device" error msg. If "external device" means the interface could the conflict be with the Firebox (24 bit/96k) I would appreciate suggestions for compatible interfaces.

Thx so much for your help. Cheers!