You've succeeded in getting noisy power and ground busses, so it seems the question/warnings are related to the quality of the waveforms. WARNINGs draw your attention to something that may not be setup quite right, even though you still achieved some result. In your case, you may need to "Identify DC Nets" so that the tool knows which planes to mesh. For example, you may need to apply 0V to your ground planes.Originally posted in cdnusers.org by Donald Telian
Either way, the non-ideal power is modifying your signal performance so it would be interesting/valuable to compare how much change you see as compared with using ideal power. And if the dark blue waveform is your receiver, I'd be concerned about its Vswing and the loss incurred from the driver (which I'm guessing is brown?).
Hope that helps. It's a bit difficult to understand the question. Also, it's helpful to vary the colors in your waveforms.