I have noticed if i wait at the win7 system for a minute it pops up saying USB device has malfunctions and/or is not recognized.
It always worked fine with Win 2k and Winxp, but now with Win7 when i switch back and forth keyboard stops working, but the mouse keeps working. I am using the USB 'hub' that is built into the KVM because it fully supports the mouse and keyboards special features where as the 2 usb ports for keyboard/mouse do not on the switch. Same issue here, i have an Avocent DVI 2port KVM, using a G15 keyboard and a Gx1000 Lazer mouse (both logitech).