Re: Utterly INSANE upload usage; Is there a way to check this?

This is a good idea as well, thanks for adding it Datalink :)

But remember, this will only monitor the throughput on the PC's and not other devices like a network hard drive, wireless devices, etc :)
But its a good start.  
As i stated elsewhere in this thread.. best way it to go device by device, till you find the culprit.