Actually this might not represent any problem. My daughter uses a Sagem WIFI-dongle with a ndiswrapper-driver that works (most of the time
) quite ok.
So I don't think that ndiswrapper is the cause. Furthermore I think that the forums would be full of messages about such a problem, don't you think?
I actually don't have any clue on how to make gaim work - personally I use amsn and it works ok as well. But on the other hand, my ISP supports IPv6...
Maybe there's a (more or less) hidden setting in these apps, kinda like the one in firefox. Perhaps you shall start a new thread asking for gaim support?