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It may be that the camera drivers are not publishing images, or it may be that the image topics are not remapped properly.

I would start by verifying that both camera drivers are publishing images; you should be able to view the image from each camera with image_view or rqt_image_view. You should also check and make sure that messages are published on the camera_info topic for each camera.

I think the prosilica node defaults to a polled mode, so you may want to check that both cameras are set to streaming mode.

If you're starting the stereo_image_proc node from a launch file, roslaunch may be hiding the warning messages from you; you can try adding the --screen option to roslaunch or adding the output="screen" attribute to your <node> tag.