I just upgraded to Parallels 9 too. Running Windows 7 (Pro x64) off a boot camp partition, I'm getting the three Human Interface Devices connecting and disconnecting constantly. They all just show up as USB Input Device, and none of the hardware details seem to provide anything further. They all say USB\VID_203A&PID_FFFC&REV_0100&MI_01. USB 3.0, web cam and bluetooth are all disabled in the configuration. Mouse and keyboard are set to "don't optimize for games".
Anything else I can provide (logs or something) that might help pinpoint something?
Edit: Just noticed something else. Under Universal Serial Bus Controllers, I see some more devices appearing and disappearing. Generic USB Hub, USB Composite Device and USB Printing Support. When the Generic USB Hub is in the device list, the General tab shows it as working, but the Power tab shows it as not working. Going into the power management tab and unchecking the box to let Windows shut it down to save power didn't have an effect.
Last edited: Aug 29, 2013