Everything works fine when one considers some!

I run the switch with wireless mouse, wireless keyboard, printer and external hard drive to two PC's.
Operating Systems XP and 8.1.
Makes Vorauf the manufacturer does not have is that when you install the USB selective energy saving must be disabled in the Control Panel! Otherwise, the switch is no longer recognized after switching off the PC and rebooted!
That is, the switch must remain energized.
Another possibility is to additionally connect a USB power adapter to the switch, which remains after switching off the PC is turned on. Thus, all connected devices are detected immediately after power-up.
In compliance with these 2 points of the switch is working properly!