I/O Sub-Menu Greyed out on track inserts drop-down in PT11 Mac

Hi there,
I am on PT 11 (trying to switch over from PT10), on a 2011 imac w/ Mountain Lion and an Echo Audiofire12 firewire interface.

It works fine in PT10, but in PT11, I can't choose from my i/o menu to, say, use a piece of outboard gear as an insert like I would use a plugin. The i/o submenu is grayed out in the inserts dropdown on any given track.

However, inputs and outputs are still working on my interface, for example: I can choose any input of my interface on a given track to record a signal into the computer.

I've tried:
- Pressing N upon launch and selecting my interface as the soundcard
- Deleting all inputs and outputs in the i/o setup menu and restoring to defaults.

Please help! Here's a screenshot...

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I/O Sub-Menu Greyed out on track inserts drop-down in PT11 Mac