The long story: THIS IS NOT A FASTRING PROBLEM. IT IS A BUILD 10240 PROBLEM.
About October 1, 2015 I noticed messages saying USB device not supported. This was on a USB 16gb thumb drive. The next morning my Windows 10 build 10240 and 1 32bit fastring and 1 64bit fastring systems could not be accessed via a Trendnet TK-407k KVM that uses 1 cable to transmit usb signals to 4 different computer.
I read a number of comments in the community about KB3093266 and my update history reflected an installation date of 09-30-2015 for that download.
I uninstalled KB3093266 along with all of the updates for September.
This seemed to fix my problem along with UNINSTALL each of the USB drivers in DEVICES and do a restart. It worked. Not sure which solution solved the problem: Uninstall USB or Uninstall KB3093266.
But I do know what caused the problem: KB309266.
Today, October 5th, my KVM could not be used again. Update history showed that
offending update, KB3093266 was reinstalled.
A comment in the Microsoft Community Forum said that another solution would be to remove FAST STARTUP/FAST SHUTDOWN AND TURN OFF AND TURN ON THE SYSTEM. That process did not work for my systems.
Uninstalling the KB3093266 and the USB drivers does not seem to be a solutions since Microsoft will send a new download of the update when it notices that the system does not have that update.
I have spend several 8 hour days attempting to fix this problem without luck. ANY suggestions would be appreciated.
THE FOLLOWING IS TRENDNET SUPPORT INFORMATION--HAVE NOT TRIED YET BUT WILL DO ONE ITEM AT A TIME:
The unit is BUS powered. Please ensure you have disconnected the USB cables from the unit simultaneously so that it loses power and then reconnect it. DONE
The KVM switch is a non-configurable appliance. UNDERSTAND, THE IT MUST BE MICROSOFT'S PROBLEM.
Please make sure that everything is connected and seated securely to the switch. Do not place any third party hardware between the KVM and the computer. Including any type of interface converters, docking
stations or extension cables. ALL CABLES ARE DIRECT FROM KVM TO COMPUTERS
Also make sure you are using the KVM cables intended for use with this switch. It may not work with third party cables. ALL CABLES ARE TRENDNET KVM CABLES
Download and update your computers video card drivers. You can also try uninstalling and reinstalling the mouse and keyboard drivers, preferably allowing the operating system to install generic drivers for
them. I HAVE UNINSTALLED ALL OF THE DRIVERS AND ALLOWED WINDOWS 10 TO INSTALL GENERIC DRIVERS.
Thanks in advance.