I had a lot of trouble with the Windows Vista install. It wanted to break up the install and put some folders in the Program Data folder because I told it to install Bryce for a single user. I gave my daughter an account on the machine so she could install WOW and Fallout. It wouldn't find the materials lab untill I re-installed it for all users. I know it breaks the eula but she's never going to try Bryce. I even deleted the shortcuts from her account. If DAZ wants different they can fix the install and fix the bug report so I can log in.

When I installed the extra pro content the root directory was wrong. I had to manually type the path to the Presets directory. There are thousands of the old image textures and billboard tiffs from bryce 3d , 4, etc in contenttextureslegacy.

You can do a search for the Clay Hagebusch directory to see if your install mis-filed the extra content. If you find it I'd try re-installing the content and edit the path so it goes to your presets directory.