I might be missing something simple, but when I create a part in 2009, then create a new configuration and change one of the dimensions, the original configuration changes as well - even though I used the "This Configuration" option in the dimension dialog.  Then I have to go into the original configuration and change the dimension there back to what is was.  At that point, the two configurations seem to behave properly.  If I use my version of 2007, all works fine, with  the original configuration unchanged.

Is there an obvious setting that I have forgotten, that might need to be changed in my 2009 version?