How to fix Safari 6 on Mountain Lion that doesn't show the full URL in the address bar unless I click it? For instance, Ask Question page URL on this site is shown as apple.stackexchange.com, but when I focus on address bar, it becomes apple.stackexchange.com/questions/ask.

I tried resetting and restarting Safari, disabling extensions and dragging the default set into the toolbar but nothing helps.
I've found that logging out and back in is sufficient for fixing this. Still a pain, but takes slightly less time than restarting (which also recovers from the failure since it forces you as well as all other users to get logged out when the Mac shuts down).