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I'm not sure which forum to put this in. Figure the display forum would more likely be KVM aware people.
But, I have a KVM that switches between 2 PCs. Everything switches correctly except for the mouse. The mouse used to work. I had it plugged into the port just for the mouse on the KVM. That worked for a while but then quit working. I then moved it to a hub on one of the other usb ports on the kvm. That seemed to work for a while too. One of the computers now it works and the other one gives me a pop up often stating there are too many hubs in series. I only have one USB hub. I know that one physical USB hub could have many logical hubs inside. So, I'm always trying to plug it into the furthest left port. But, I have a webcam also plugged into the USB switch and it works flawlessly when switching PCs.
Right now I just keep unplugging the usb receiver from the pc and laptop and swapping them as I switch between the computers. Just really annoying when the KVM is supposed to do that (and it used to work.)