To those with the 4965 chipset, it may be helpful if you were to let derv know whether or not grimwepa detected your chipset. I believe you should get some sort of message indicating that it has detected you have the 4965 chipset.
Check airodump-ng to make sure that you are still collecting data packets also. You should be able to create traffic on the network since its yours. For whatever reason, sometimes the wireless card seems to freeze and stops collecting data packets even if they exist. Not sure what the solution is, but just something to note.
Also, try "killall wicd wicd-client dhclient wpa_supplicant" before you start using the tool. The 4965 chipset is extremely finicky; everything has to be just right for it to work. Luckily I just got a new laptop and don't have to deal with it anymore