[Libusb-win32-devel] Problems using libusb after installing AVR32 Studio 2.2

[Frank T. <fr...@fr...>]

(I have posted this on the AVR Freaks forum, so apologies if this upsets 
anyone)

After installing AVR32 Studio 2.2 (2.1?) libusb stopped working for other 
applications. (This is on Windows XP) 

The symptoms were no devices being listed through the libusb listing 
functions. (usb_find_busses/devices)

To fix this, I reinstalled libusb-win32 0.1.12.2. 

This helped to get libusb listing the usb devices, but there is still another 
problem. 

My application talks to my AT90USB1287 device, and can tell it to go into boot-
loader mode. The problem is, when I do this, libusb is listing 2 identical 
AT90USB1287 DFU devices which confuses my application. There is definitely 
only one device connected. usbview.exe (from www.usb.org) lists only one 
AT90USB1287 DFU device plugged in. 

I've uninstalled AVR32 Studio, the gnu tool chain, libusb and something called 
AVR USB, then reinstalled libusb-win32, but the problem remains. 

This is definitely a configuration problem. The same software compiled for 
Linux works fine. 

Any ideas? Does this sound like a libusb problem? Or is there another device 
driver on my system reporting a duplicate device? 

Thanks, 
Frank