I got it working properly back to normal.
It happens that when the USB cable is plugged into the POD, both outputs are giving the "model" signal.
Just unplug the USB and you're good to go with both analog outputs, unless you use the pod as an USB audio interface.
In the latest scenario, DI is on USB Left and Model is on USB right.
AUTO-MERGE: When headphones or USB are connected, only the Model signal path is output, sent to both Model & D.I. output jacks as well the headphone jack and both effects send jacks.
When a cable is connected to one 1/4-inch output (Model or D.I.) of the Bass PODxt Pro and not the other, both effect send outputs will be sent the signal for the connected jack.