Hope I'm not duplicating anything already written - if so I'm sorry, but I have looked a bit (though perhaps not enough!).
I'm using a Picoscope automotive system, running on a laptop, as supplied by TCD, and find that the waveform display is completely wrong at timebase settings in excess of 100mS. I'm not sure what it it showing, but its not real! Dont have the system at hand at the moment, but the software is probably only about 2 months old, as this is when tha system was purchased