DAT input issue with AJA ProIO and FCP

Hello,

Powermac dual 2.5 G5, FCP 5.0.4, AJA ProIO LA, Sony PCM-7040 DAT.

The problem is I'm getting a single dropped frame at intermittent intervals while inputting sound from the DAT deck into FCP. The DAT is linked to FCP via my AJA ProIO LA, recording channels 1 and 2 (not putting the DAT's Timecode Out to Ch3 if that matters).

The DAT tapes were recorded NDF, and my sound guy thinks the problem is FCP is not capturing in NDF (perhaps forcing DF input and causing problems). I went into the Device Control Presets and noticed that the Sony RS-422 protocol disables DF/NDF from being selectable. I _am_ using older drivers for the ProIO (v2.0; v3.0 is the most recent), so I don't know if they updated that setting. But I'm hoping there's a workaround so I can take care of this asap, then update the drivers later.

Beyond that I'm stumped. Thanks for any help.