Safari windows are mostly "Untitled" after restore
Since upgrading to Mavericks my Safari windows are mostly Untitled after quitting Safari (or shutting down and rebooting the Mac) then bringing up Safari again. If I had, say, seven windows open, then the first two or three may have titles, but the rest are "untitled" until I click and restore each one. They do restore OK to what they were originally, but I don't know what they are until I restore them.
Never had this problem before. I've tried disabling the extensions and pugins. I've also tried putting the Safari plist files into Trash. Nothing works.
Is this a known issue? Any ideas about how to fix it?
MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.3)