KVM switch and Mavericks don't play well together

I upgraded to Mavericks yesterday, and started having this very annoying problem with my KVM switch, which used to work fine with Mountain Lion. I've been using this KVM switch for my mac mini and PC, in order to share my keyboard and mouse, very stably for several months.
Basically, when switching back and forth, there is a chance that ALL the peripheral devices would stop working in Mavericks. This includes my apple bluetooth keyboard and the magic touchpad, which are not related with USB (or maybe the bluetooth chip is still hooked up via USB inside).
For some reason, screen sharing stops working too, althought the IP I was trying to connect to was the ethernet port.
If I try to do a shutdown -r now via SSH, the system tries to shut itself down, but would get stuck with a spinning animation on the screen.
There is nothing in the system log, no error message.
My KVM switch is an IOGear GCS42UW6. Connected USB devices are: Apple USB keyboard and Logitech G500 mouse.

10.8 worked well with my Mac Mini (2009) connected to IOGEAR KVM model GCS1108. My mouse is from Redmond and the keyboard is a Goldtouch.
Mavericks has a problem with my KVM switch as well. It seems to be a USB problem.
Case 1: The Mini's video is connected to the KVM switch -- mini DVI port to DVI. If the KVM USB cable (known good) is connected, the Mini chimes at boot but no grey Apple logo appears. LCD remains blank white. Boot does not progress.
Case 2: The Mini's video is connected to the KVM switch, as before. If the KVM USB cable is NOT connected, the Mini chimes at boot, the grey logo appears, and boot proceeds normally. Video is fine. I  then connect the KVM USB cable to the Mini and use keyboard and mouse. KVM switching works as expected.
If the KVM USB cable is NOT connected but a keyboard and mouse are connected directly to the Mini, the boot sequence is normal. Video works.
The problem is not the hardware, all of which worked well with 10.8 (Mountain Lion). I would downgrade if Apple made 10.8 available from the App Store.

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