I made a small adjustment to the BTCChina API in my code. It still works for me and maybe it will work for more people, maybe it was my code.
I have updated the download to version 0.9.0.5 beta, is there somebody willing to give it a try?
I did a test with 0.9.0.5 and BTCChina returned 401 again in the first try.
So I made a deposit in BTCChina and traded once. I then waited about half an hour, tried again and guess what..
it worked!
After that I did a test with 0.9.0.4 and it was working too!
Whoever did not get BTCChina working yet, try making a deposit and a trade, it might do the API activation trick for you as well.