When you move a page it generates a message that says 'X' page moved to 'Y'... but if there are any spaces in the title it leaves them out so 'Ancient Rome' apparantly becomes 'AncientRome'. So of course if you try to access the page via the link you can't because it takes you to a blank edit screen! Like I said, disconcerting, because it made me think I'd managed to 'lose' several long entries before I worked out what was going on. If you go to the recent changes screen the correct title has actually been generated.