When you right click on the toolbar in Safari 4, you can modify which icons show up.
I wanted the Reload Icon:
But only saw the Stop Icon:
Your default image for the Stop/Reload button should actually be this:
and that button should be labeled Reload/Stop since it's default state on the menu bar is Reload and not Stop.
Looks like the default has changed since I first looked at this. When I first tried Safari 4 there was no Stop/Reload button on the toolbar.
The Stop/Reload should still be changed to Reload/Stop though.
How to get the blue progress bar back in Safari 4