Logic 9.1.8 is not seeing my "Audio Line-Out Port" (that's now it is labeled in the System Preferences under Audio). It's the headphone jack on the back of my Mac Pro 12-core. Other devices (iTunes, system sounds) are able to play to my speakers which are connected via that port.
My 2 options in Logic are: "Built-In Output" and "Built-In Line Output". Neither works.
How can I fix this? I am unable to play back anything at all from Logic. The levels are peaking like normal, but no audio from the speakers.