In Ubuntu 8.04. I just installed the latest SVN version to see if this would go away and it does not. To recreate I simply click Places then Home Folder. Then right click on the icon on the dock then click on close on the pop out menu.
This then closes the window but several seconds later a message box pops up as if the program had stopped responding. The message reads: Force this application to exit? (Any open document will be lost.)
Clicking OK closes Nautilus and then reopens the window. Clicking cancel results in leaving the application closed.
Not sure if its something unique to my setup. Can anyone else confirm?