AJA IO XT problems with MC 8.5

Hi,

Is anyone using AJA IO XT with MC 8.5 or MC 8.5.1? I'm in a testing phase with this box and getting the old Audio Legend underun crash constantly. I'm on El Capitan 10.11.3 and MC 8.5.0 on a new Mac Pro 12-core.

I know the latest AJA drivers don't list MC 8.5 as supported but is anyone using any AJA configuration that's working?

Thanks.