I have Firefox set up to save downloaded files to Desktop but newly downloaded files don't appear until the desktop is refreshed by hitting F5. Occasionally I get a similar story when deleted files don't disappear until F5 is pressed.
The more I use Windows 7, the less I understand how it can be considered a better product than Vista. Vista SP2 was working out much, much better for me. The small inconveniences in in 7 has sent usability down the pipes.