Hmmm. That's one I don't know about.
If you happened to drag (left-click-drag) the graph a tiny bit right at the point you were doing your comment, then the time-graph will stop moving. This doesn't change the way data is *collected* at all, though.
The fact the you could re-focus on the current time makes me think that's probalby what happened.
Now, the corrupted data is very odd. If memory was physically corrupted somehow (either by a program bug or hardware problem), I'd expect to see peaks a lot higher than 950, as the scale on this graph goes to 32767. Having random data in just the lower 2% of this range would be really odd.
Do *all* the hops show this same issue?
Did you save the data so you can send it to me?
Thanks,
Pete