sorry for my late reply to your last post!
Your issue is quite strange!
Currently I've only one idea, that might probably help or at least show a different behaviour of the driver:
Please create a new user, with no special settings regarding permissions or access restrictions, etc. and start the driver again. Any changes?
What happens if you start the driver automatically from the inittab (I think its "upstart" for Ubuntu) when you log in as
a) your user "mattias"?
b) this newly created user (mentioned above)?
Please let me know what the results of these test are.
I also sent you a beta version of our driver, although I doubt it will change something here. Please also let me know how this version works.