I have Concrete5 (running 5.4.1.1) site dayacheson.info that has been well for 18 months, with recent page modifications Nov. 2012, that have been 'well' till last week now showing "Page not found" for two sub pages.

Dashboard will present same message, so I don't know how to get in to see what might have happened with the links.

For example, for the page 'dayacheson.info/minihip' I get "page not found". HOWEVER, if I look up 'dayacheson.info/minihip/minihip' the page appears. The second page that is gone is '.../guestbook' and this does not appear with '.../guestbook/guestbook'

Perhaps a have a circular link? Any ideas on how I check this or get Dashboard working again are most welcome.

As this was sudden without any recent edits by me are there any suggestions of where else outside of Concrete5 to look?

Thanks :)