Wireless bridge setup pain

Trying to set up a wireless bridge again and it is not working.

Raspberry Pi
Raspberry Pi (Photo credit: tkramm)

I am using the Raspberry Pi and I can get the bridge device up, but it does not look like it is passing packets in both directions. To be honest I am not sure what is going wrong and I have posted a query over on Superuser – here – but the one answer so far is not the solution.

Any help gratefully accepted.