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ADC12QJ1600EVM: Inputs on INCP and INDP are severely attenuated in HSDC Pro

Part Number: ADC12QJ1600EVM


Given an input sine wave 250MHz and 0dBm on INAP and INBP, HSDC Pro displays an accurate representation of the signal--there is a little loss, but not much.  

Connecting the same input signal to INCP or INDP, the power of the tone is attenuated by 60dB.  What could be causing this attenuation?

Everything else appears to be functioning correctly.