windows file explorer not auto-refreshing

Sometimes (intermittently) my windows file explorer decides that it is not going to auto-refresh. Any changes I make to files (rename, move, delete, copy) don't show up until I hit f5 or do something else to force a refresh.

I think it possibly only starts happening when I'm looking at thumbnail photos under 'My Pictures' ...or it may just be that this is where I notice it most (do a lot of photo renaming etc)

I've found I can make the problem go away by killing (restarting) explorer.exe

I've had my Windows XP machine about a year, and just tolerated this slight annoyance all this time, but I did wonder if any other people had seen this problem.

Someone else seems to have described it here: http://www.dellcommunity.com/supportforums/board/message?board.id=sw_winxp&message.id=69390

Note we are talking about the windows file explorer NOT internet explorer