Man you've quite a lot of networks in one system you know that. ^^

First thing I saw is that the WiFi get in the way in the default routing:
Such that the PAN (0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.2 296) is never reached.

To make the case more complicated, you've wifi routing activated in your N900, such that you've two default routes in your N900: (http://img190.imageshack.us/i/87881079.png/)

If you're not that familiar with tcp/ip routing, you should really turn off everything else before connecting to another network you've never got it worked.

Try again and let me know the result.