[Paparazzi-devel] Lisa m firmware upload problem help needed

[Chris]

I am sure that this is easy but not for me...
I am trying to upload the firmware on an homemade LISA M and i get this 
error:

Traceback (most recent call last):
  File "/home/hendrix/paparazzi/sw/tools/dfu/stm32_mem.py", line 78, in 
<module>
    dfudev = dfu.dfu_device(*dev)
  File "/home/hendrix/paparazzi/sw/tools/dfu/dfu.py", line 84, in __init__
    self.handle.claimInterface(iface.interfaceNumber)
usb.USBError: could not claim interface 3: Operation not permitted

I can upload the firmware just fine as root and the udev rules are 
copied as per the wiki.
The paparazzi software (stable) is clean installed from git and i run 
Ubuntu 12.04 with Cinnamon.
Any ideas?
Chris