Pro Tools Hardware Inserts 9 with ProjectMix

[aqueronte]

I have a Pro Tools 9 and a ProjectMix.
I have also external hardware connected via ADAT. The inputs and outputs are properly configured, both physically and in the I / O Setup. The device to signal that comes through ADAT 1-2 output, returns by ADAT 1-2 input.

If I make a hardware insert, creating an auxiliary track and inserting the hardware, I miss a rare thing:
The signal reaches my external device, it's process correctly, returns to the ProjectMix (in fact through the control panel ProjectMix I can hear fine) BUT IT DONT RETURN TO PROTOOLS.

That is, the auxiliary track where I have the insert return signal not processed.

If I add another track auxiliary with ADAD 1-2 as input I get good signal.
But then, I cant apply the Delay Compensation.

Any hints of what's happening?

thanks!