I have an Aten 2-Port USB KVM switch. Up until 2 days ago all working well and then it gave up the ghost. I have just replaced it with an identical switch but now the mouse I have won't work. I have tried another mouse which works fine but the mouse I want to use just scrolls screens or goes left to right. The driver is up to date but it just won't allow me to use the mouse. It's as if it is stuck in scroll mode and just moves pages up and down rather than the pointer.
I have often found issues with KVM switches and have got round them by just using the Monitor sharing part and plugging a mouse / keyboard directly into each PC. Not a solution but just a work around for now.
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