Tether on Quarx's 7.1-11 rebooting defy

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As the title says, if I try to enable USB or Wifi tethering on Quarx's 7.1-11 it won't work and at some point the phone reboots (to cyanogen mod logo, not the wasp screen).

I tried on Ubuntu who sees a connection but loops trying to connect without success, and Win 7 x64 who sees and install the adapter but can't connect through it. In both cases after a few minutes the phone reboots.

Wifi tether won't start and reboots the phone too.

Googled around to find an answer but didn't find anything helpfull.

It works with some wifi tether with an app from the market, but I would really have liked to get USB or at least default Wifi tether working rather than relying on an app, and I'm reading that it seems to work for most people so I wonder if my carier (Orange France) didn't sell me a phone where they disabled tethering at hardware level, would it be possible?

My phone has a green lense in case it could help find an answer.