Unable to use the back/forward buttons in the OPEN menu
 

I recently upgraded to Excel 2007 and Windows 7. Previously I was able to ask
the program to 'open' and then go back/forward through the folders to get to
the next location as needed. Now I have to start over every time. The back
and forward buttons are alway gray and the address bar is blank if I try to
pull it down. Getting tired of having to use the Nav panel and start over
every time.... Any ideas? Thanks!