At the moment in Sarproz you can analyze multi-temporal stacks of images with a single polarization (any of your choice)
Or you can import multiple channels (=polarizations) for a single image
The generation of multi-temporal multi-channel stacks at the moment is not implemented. You should generate multiple single-channel multitemporal stacks. However, if you choose the same master image (it does not matter if the polarization is different), you could them merge all of them in a same stack. We will implement this option soon.