I personally don't think that Bryce 6 was any more buggy than for example Poser when it was first issued. I think we all have to remember that there are so many different operating systems out there now and different setups that it is difficult to make sure that any software works well on all of them. 
The people who are working on the Bryce software don't read the forums they do read the bugtracker and that is where you need to put any problems for their attention. However, I would suggest first posting it in the DAZ Bryce forum because someone else may have the answer that you need. 
There is a free update being worked on now at the moment and I believe that that will be ready in the first quarter of 2007. 
Can I just add that I have seen more posts saying how pleased people are with Bryce 6 than I have about problems with Bryce 6? 
If you are having problems changing textures in Bryce are you importing through DAZ Studio and have you broken the link first?