I've now installed the 4.33f version since I was unable to install 4.22. But, alas, it won't connect to my board. I do have another Future Devices USB device (not connected currently) so I was not prompted to install a driver when I plugged in my KFlop. I've rebooted, plugged/unplugged the board and can't get a connection. I do not know if the issue is my KFlop (it's new, untested by me), 4.33f, or my system in some way. I have no problems connecting to various USB motion controllers like Smoothieboard, RAMBo, RAMPs, etc (about 7 in all). Any suggestions or debugging tips? I do see the KFlop listed in the USB devices list.