Yeah, that was a new feature introduced in 2.6. You can deactivate it with gconf editor utility, I don't remember the exact option but was something about spatial browsing.
EDIT: A little google showed the right steps to deactivate this:
goto /apps/nautilus/preferences/always_use_browser and enable this option
This is the description of that option: "If set to true, then all Nautilus windows will be browser windows. This is how Nautilus used to behave before version 2.6, and some people prefer this behavior."
Last edited by gbonvehi; 11-08-2004 at 07:15 AM.