Keyboard loss with trendnet TK-207k KVM switch

I am using a trendnet TK-207K KVM switch for 2 computers, one running WinXP sp2, the other Fedora Linux. We had one previous model that worked for a while, then the keyboard dropped out, and later the mouse. I talked to trendnet support and they said the problem was the switch, return it. I got this model to use while I waited, but the keyboard doesn't work either. Of course I tried rebooting, different USB ports, etc to no avail. Linux worked OK, and the windows comp worked from the point of turning it on until the log in screen. In the device manager it shows ,I am jest going by memory, something like can't load driver, missing or corrupt. I said search for new driver, It didn't work. Keyboard works OK plugged in directly. By the way, this is a usb switch. Also I am using an older ps2 kvm switch on 2 other comps, and the keyboard also stopped working on them. Any idea what might help, is it maybe a recent windows update?