I think I might have found a bug with the BFgminer-FutureBit-5.4--win64 build, related to plug and play ability of some mice and keyboards. I think it has to do with bfgminer or windows attempting to constantly recognize new devices as hubs or mining devices. Or maybe it's some sort of conflict with the way the keyboard works, since it is a usb composite device with a usb port on the back. Specifically I am using a Logitech G110 keyboard with a Corsair M95 mouse, the mouse is plugged into the usb port on the back of the keyboard, and then that usb cable from the keyboard plugged into the back of the windows 7 desktop. I like to use the same mouse and keyboard between a few devices, so the problem comes when I have bfgminer running and I unplug my mouse and keyboard and then when I plug it back in the mouse and keyboard won't work. I thought mice and keyboards were supposed to be generally plug and play, and I already have the drivers installed for the mouse and keyboard and plug and play seemed to work fine before bfgminer. Also, after this happens it prevents any new keyboard from working that is plugged in (even a different standard keyboard, and even though the keyboard is receiving power as shown by the lights). It's pretty frustrating not being able to use a keyboard, even though I can usually get a standard mouse to work if its plugged in directly. I will keep playing with things to see if I find an easy solution, otherwise I could just keep the same mouse and keyboard plugged in. When I plug in some usb device then bfgminer throws up some sort of failed errors about not recognizing a usb device or hub or not finding a specified file and Windows acts like it's trying to install drivers for some reason, even though I should have the drivers already, so I tried turning off windows update to try to keep windows from trying to find drivers, no luck.
PS. not sure if it matters but the PC I'm using is an Asus Essentio CM6870 US-3AD model, core i7 3770, 16GB ram, 2TB hdd, Windows 7 home premium 64 bit SP1 (just realized it came with asus ai charger, wonder if that's why I was able to get 3 running without a powered usb hub). Other usb devices plugged in besides the superbpag hub with 4 moonlanders is just 2 usb fans, a printer, and the mouse/keyboard I mentioned earlier.