Similar problems
Hi,
I had the same problems you're reporting, though I'm running OS 10.2.8 on my PowerBook G3 (300 MHz).
Not only did the adaptor lockup my computer -- something I had not seen my computer do since I installed OS X -- but the adaptor would act as though it were "offline," though the system preference screen indicated a solid connection.
D-Link technical support was helpful enough -- and more than condescending enough -- but it didn't help. In the end, I returned the adaptor.
Still looking for another solution. I hear the Belkin gear is solid, but I don't know the model numbers. Hopefully, someone that responds to this thread can pass along the info.
Best of luck with a solution.