FCP 6 won't see AJA Io no matter what I try

Any help I could get would be greatly appreciated.

I'm trying to capture a bunch of Beta tapes from a Sony deck through an AJA Io to a Macbook running FCP 6. The ProIo control panel sees the Io just fine. I'm getting video on a monitor hooked up to the Io. I just can't seem to get FCP to see the video. I've tried installing the latest drivers, I've tried legacy drivers, I've tried downgrading and re-upgrading the firmware of the Io, but nothing seems to work.

I was hoping someone might have an idea what I could try next.

Thank you,
Brian

Sony UVW-1800 Betacam SP
AJA Io
Macbook Pro 2.33 GHz Core 2 Duo
4 GB 667 MHz DDR2 SDRAM
Mac OSX 10.4.11
FCP 6.0.6