Trouble with audio i/o with Mbox...

This may actually be a system-wide issue, not a Logic Pro issue, but it only affects me vis-a-vis Logic, so here we go...
I'm trying to use the (original) MBox as an Core Audio interface with Logic Studio. I installed the Core Audio drivers and the Mbox shows up in the drop-down menu of devices in both the Sound Control Panel in my System Prefs and in the Audio Preferences in Logic Studio. But there's no actual audio i/o happening. Having selected it as the device in prefs, and trying to playback output through the Mbox -- or record input through it, there's just nothing happening. Silence, and no response on the meters to input. Other audio interfaces work (i.e. a USB mic/headset; built-in mic and speakers, etc). The internal soundcard on the Mbox seems to be fine, as I can hear the input from the mic running into the Mbox in the headphones I have connected to the device.
I quit Logic and rebooted the Mbox. When I relaunched Logic, and the Digi CoreAudio Manager opened, I started getting a sort of morse code type of sound through my cans. Not feedback, more like digital beeps and such. But in any event still no input/output connecting with the Mac.
Two things to add to the mix: (1) while the device is visible in the System Prefs Sound Control Panel, it doesn't register any input or output on its little built in meters, either -- which makes me think this is s system-wide issue, not a Logic issue; (2) the first time (and only the first time) I selected the Mbox as the Core Audio device in the Logic Prefs, the meters in Logic Pro appeared to indicate there was a feedback loop (peaking on inputs and outputs), though there was no actual sound. I switched off the 48V button on the MBox which killed that problem, but since then, it won't register anything at all.
Any ideas? Thanks!

Digidesign Hardware/drivers are not yet compatible with Leopard. There are thousand of threads about this whenn you do the Google search.
http://duc.digidesign.com/showflat.php?Cat=&Number=1247756&Main=1247729

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