http://captainkimo.com/canon-eos-5d-mir ... -fell-off/
the 5d mk 1 had adhesive failure and lots of them, I think you can still hit on them to sort it out as it is a known problem and also was an issue on some of the mk 2's
lots have glued it back on themselves as an emergency fix and there should be 4 points where the glue was.
a "small" amount of superglue, too much leaves chemical fogging on the glass sometimes
Canon should fix it though me thinks. (one would hope)
hope they sort it for you Walter!
I want to stand as close to the edge as I can without going over. Out on the edge you see all the kinds of things you can't see from the center.