In PTHD9.0.6
Zooming Span all the way in dB, analyzing ProTools Pink Noise Signal generator, I could see aliasing/phase cancelation ripples @96KHz...
But...
The free VST
MDA Pink Noise TestTone Generator... Was flawless.
Wrapped with FXPansion RTAS adapter.
PT signal generator ripple bug/problem was the same in Windows & OSX.
.